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    Java Interview Questions

    Rumman Ansari August 03, 2026 11 views Subject Details
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    Question 1
    What is an exception?
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    Question 2
    Rewrite the following program segment using while instead of for statement. int f = 1, i; for(i =…
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    Question 3
    What will the following code output: String s = "malayalam"; System.out.println(s.indexOf('m'));…
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    Question 4
    State the data type and values of a and b after the following segment is executed: String s1 =…
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    Question 5
    State the method that: Converts a string to a primitive float data type. Determines if the…
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    Question 6
    State the output of the following program segment: String s = "Examination"; int n = s.length();…
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    Question 7
    Give output of the following program segment: double x = 2.9, y = 2.5;…
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    Question 8
    What will be the result stored in x after evaluating the following expression? int x = 4; x +=…
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    Question 9
    State the values of n and ch. char c = 'A'; int n = c + 1; char ch = (char)n;
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    Question 10
    What are the values of x and y when the following statements are executed? int a = 63, b = 36;…
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    Question 11
    In the program given below, state the name and the value of the: method argument or argument…
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    Question 12
    Example of Array Declaration and Initialization
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    Question 13
    Name the Java keyword that: indicates that a method has no return type. stores the address of the…
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    Question 14
    Write statements to show how finding the length of a character array char[] differs from finding…
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    Question 15
    What is the difference between a break statement and a continue statement when they occur in a loop?
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    Question 16
    Name any two wrapper classes.
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    Question 17
    What are the types of casting shown by the following examples? double x = 15.2;int y = (int) x; int…
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    Question 18
    Give a difference between a constructor and a method.
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    Question 19
    State the Java concept that is implemented through: a superclass and a subclass. the act of…
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    Question 20
    What is a literal?
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    Question 21
    What is meant by precedence of operators?
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    Question 22
    Differentiate between public and private modifiers for members of a class.
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    Question 23
    Name the search or sort algorithm that: Makes several passes through the array, selecting the next…
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    Question 24
    What is an array? Write a statement to declare an integer array of 10 elements.
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    Question 25
    Write a statement each to perform the following tasks on a string: (i) Find and display the…
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    Question 26
    Write an expression in Java for:z = (5x^3 + 2y)/(x + y)
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    Question 27
    Give the prototype of a function search which receives a sentence sentnc and a word wrd and returns…
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    Question 28
    Explain the concept of constructor overloading with an example.
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    Question 29
    What will be the output of the following code? (i) int k = 5, j = 9; k += k - j + k;…
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    Question 30
    Analyse the following program segment and determine how many times the loop will be executed and…
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    Question 31
    What is the role of the keyword void in declaring functions?
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    Question 32
    Write the output of the following:(i) System.out.println(Character.isUpperCase('R'));(ii)…
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    Question 33
    Give the output of the following: String n = "Computer Knowledge."; String m = "Computer…
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    Question 34
    Name the keyword that: (i) Informs that an error has occurred in an input/output operation.(ii)…
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    Question 35
    What are library classes? Give an example.
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    Question 36
    Complete the code below to create an object of Scanner class: Scanner sc = ____ Scanner(__________);
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    Question 37
    Define Trademarks.
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    Question 38
    Create a class with one integer instance variable. Initialize the variable using: default…
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    Question 39
    Name the type of error (syntax, runtime or logical error) in each case given below: Division by a…
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    Question 40
    Write a Java expression for √(2as + u²).
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    Question 41
    Differentiate between call by value or pass by value and call by reference or pass by reference.…
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    Question 42
    Give one point of difference between unary and binary operators.
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    Question 43
    Give one example each of a primitive data type and a composite data type.
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    Question 44
    Write one difference between Linear Search and Binary Search. Java Language
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    Question 45
    (i) Name the package that contains the Scanner class.(ii) Which unit of the class gets called when…
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    Question 46
    Write a Java statement to create an object mp4 of class Digital.
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    Question 47
    Name the keyword which is used- to resolve the conflict between method parameter and instance…
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    Question 48
    Name the wrapper classes of char type and boolean type.
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    Question 49
    Identify the literals listed below: (i) 0.5 (ii) 'A' (iii) false (iv) "a"
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    Question 50
    What are identifiers ?
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    Question 51
    Name any two OOP’s principles.
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    Question 52
    What are the default values of the primitive data type int and float?
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    Question 53
    What will be the output when the following code segments are executed? (i) String s = "1001"; int x…
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    Question 54
    Consider the following class: public class myClass { public static int x=3, y=4; public int a=2,…
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    Question 55
    Study the method and answer the given questions. public void sampleMethod() { for (int i=0; i < 3;…
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    Question 56
    State the value of characteristic and mantissa when the following code is executed: String s =…
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    Question 57
    Evaluate the value of n if value of p = 5, q = 19 int n = (q – p) > (p – q) ? (q – p) : (p – q);
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    Question 58
    Arrange the following primitive data types in an ascending order of their size: (i) char (ii) byte…
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    Question 59
    (i) What will this code print ? int arr[]=new int[5]; System.out.println(arr); 0 value stored in…
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    Question 60
    (i) Name the mathematical function which is used to find sine of an angle given in radians.(ii)…
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    Question 61
    The access specifier that gives the most accessibility is ________ and the least accessibility is…
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    Question 62
    State the output when the following program segment is executed: String a ="Smartphone", b="Graphic…
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    Question 63
    What is the function of catch block in exception handling ? Where does it appear in a program ?
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    Question 64
    State the data type and value of y after the following is executed: char x='7';…
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    Question 65
    What are the values of a and b after the following function is executed, if the values passed are…
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    Question 66
    Name the two types of constructors
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    Question 67
    What is the value stored in variable res given below: double res = Math.pow ("345".indexOf('5'), 3);
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    Question 68
    What is the data type returned by the library functions : compareTo() equals()
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    Question 69
    Give the output of the following method: public static void main (String [] args){ int a = 5; a++;…
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    Question 70
    Rewrite the following program segment using if-else statements instead of the ternary operator:…
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    Question 71
    Which of the following are valid comments ? /*comment*/ /*comment //comment */comment*/
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    Question 72
    Name the method of Scanner class that: is used to input an integer data from the standard input…
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    Question 73
    What is the final value of ctr when the iteration process given below, executes? int ctr = 0;…
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    Question 74
    If int n[] = {1, 2, 3, 5, 7, 9, 13, 16}, what are the values of x and y? x = Math.pow(n[4], n[2]);y…
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    Question 75
    Write a Java expression for: \[ \begin{align} \\ & u t + \frac{1}{2} f t^2 \end{align} \]
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    Question 76
    What is the data type that the following library functions return? isWhitespace(char ch)…
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    Question 77
    How many times will the following loop execute? What value will be returned? int x = 2, y = 50; do{…
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    Question 78
    Rewrite the following program segment using the if..else statement: comm = (sale > 15000)? sale * 5…
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    Question 79
    What does a class encapsulate?
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    Question 80
    What is meant by a package ? Name any two java Application Programming Interface packages.
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    Question 81
    Name the primitive data type in Java that is: a 64-bit integer and is used when you need a range of…
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    Question 82
    State the output of the following program segment: String str1 = "great"; String str2 = "minds";…
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    Question 83
    List the variables from those given below that are composite data types: static int x; arr[i]=10;…
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    Question 84
    hat is constructor? When is it invoked?
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    Question 85
    What is an infinite loop? Write an infinite loop statement.
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    Question 86
    Give two differences between the switch statement and the if-else statement
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    Question 87
    Identify the statements listed below as assignment, increment, method invocation or object creation…
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    Question 88
    Operators with higher precedence are evaluated before operators with relatively lower precedence.…
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    Question 89
    Find the errors in the given program segment and re-write the statements correctly to assign values…
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    Question 90
    State one difference between the floating point literals float and double.
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    Question 91
    State the values stored in the variables str1 and str2: String s1 = "good"; String s2 = "world…
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    Question 92
    The characteristics of the ___________ objects are considered to be the data members of the…
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    Question 93
    Define the following with an example each. (a) Inheritance (b) Polymorphism
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    Question 94
    What is meant by Encapsulation?
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    Question 95
    Mention two limitations of procedure oriented programming approach.
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    Question 96
    What is meant by a base class and a derived class?
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    Question 97
    Why do we prefer object oriented approach in complex programming? Explain.
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    Question 98
    Name four basic principles of object oriented programming.
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    Question 99
    What is object oriented programming? Name two object oriented programming languages.
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    Question 100
    In encapsulation, data can be ___________ or ___________ whereas, in data hiding, data must be…
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    Question 101
    ___________ confirms the security of data members from being manipulated from unauthorized access.
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    Question 102
    In what way is Data Hiding related to Data Abstraction?
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    Question 103
    Give an example to explain Data Abstraction.
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    Question 104
    The ___________ of a class differs on various characteristics.
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    Question 105
    A real world object deals with characteristics and ___________ .
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    Question 106
    A class is also considered as an ___________ factory.
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    Question 107
    Creating ___________ is the fundamental concept in object oriented programming language.
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    Question 108
    Which of the Object Oriented programming principles explain the following illustrations? Justify.
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    Question 109
    Give two differences between Procedure Oriented languages and Object Oriented languages.
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    Question 110
    'Encapsulation reduces the complexity and makes the system easier'. Explain this statement with a…
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    Question 111
    Give two differences between Data Hiding and Encapsulation.
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    Question 112
    What is meant by Data Hiding?
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    Question 113
    ___________ promotes the reusability feature, in object oriented programming.
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    Question 114
    Feature of wrapping ___________ and ___________ as a single unit is called encapsulation.
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    Question 115
    ___________ is an act of representing essential features without including background details.
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    Question 116
    Write the difference between POP and OOP.
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    Question 117
    Write the difference between High Level Language and Low-Level language?
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    Question 118
    Write the difference between High Level Language and Low-Level language.
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    Question 119
    Write two Advantages of High-level language?
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    Question 120
    Write any two advantages of Procedural Oriented language
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    Question 121
    What do you mean by Computer language? Name any two computer languages.
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    Question 122
    What is routines?
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    Question 123
    What is procedures ?
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    Question 124
    What is procedures ?
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    Question 125
    Define Polymorphism with a real-life example.
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    Question 126
    Write any 2 disadvantages of Object-oriented programming.
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    Question 127
    Using a function for multiple operations is called as ___________ .
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    Question 128
    Objects can communicate with each other through ___________ in object oriented programming language.
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    Question 129
    ___________ is the fundamental concept in object oriented programming language.
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    Question 130
    What is difference between float and double in Java?
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    Question 131
    Write down any two disadvantages of Machine Level Language
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    Question 132
    Write down two advantages of Polymorphism.
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    Question 133
    Write the difference between Assembly language and Machine level.
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    Question 134
    Write the difference between Polymorphism and Encapsulation.
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    Question 135
    Write the difference between Polymorphism and Encapsulation.
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    Question 136
    What is the default value of byte datatype in Java?
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    Question 137
    An object of a class is created by using a keyword ___________ .
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    Question 138
    State the total size in bytes, of the arrays a[4] of char data type and p[4] of float data type.
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    Question 139
    Analyze the following program segment and determine how many times the loop will be executed and…
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    Question 140
    What will be the output of the following code? char x = 'A'; int m; m = (x == 'a') ? 'A' : 'a';…
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    Question 141
    What will be the output of the following code? int m = 2; int n = 15; for(int i = 1; i < 5; i++) {…
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    Question 142
    What do you understand by the term data abstraction? Explain with an example.
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    Question 143
    Differentiate between private and protected visibility modifiers.
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    Question 144
    Write the difference between length and length() functions.
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    Question 145
    Differentiate between static and non-static data members.
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    Question 146
    What is the result stored in x, after evaluating the following expression?Given: int x = 5;…
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    Question 147
    State the purpose and return data type of the following String functions:
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    Question 148
    Give the prototype of a function check which receives a character (ch) and an integer (n) and…
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    Question 149
    State two features of a constructor.
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    Question 150
    What is the difference between / and % operator?
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    Question 151
    What are the two ways of invoking functions?
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    Question 152
    State the difference between entry controlled loop and exit controlled loop.
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    Question 153
    What does the token 'keyword' refer to, in the context of Java? Give an example for keyword.
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    Question 154
    Difference between an object and a class?
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    Question 155
    (ii) What is the use of the keyword import?
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    Question 156
    Why is an object called an instance of a class?
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    Question 157
    What will the following functions return when executed?
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    Question 158
    Write a statement each to perform the following tasks on a string:
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    Question 159
    Write two advantages of using functions in a program.
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    Question 160
    What is an Exception? Name two Exception handling blocks.
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    Question 161
    Name two jump statements and their use.
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    Question 162
    What are the guiding principles of Data Protection Act?
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    Question 163
    Write some facilities of Internet.
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    Question 164
    What are the three types of Intellectual Rights?
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    Question 165
    Give two examples of Intellectual Property.
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    Question 166
    What does the word Ethics mean?
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    Question 167
    A class is also referred to as 'Object Factory'. Comment.
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    Question 168
    What does the following statement mean? Employee staff = new Employee ( );
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    Question 169
    Define class and object with an example.
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    Question 170
    How will you define a software object?
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    Question 171
    Write two disadvantages of electronic mail.
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    Question 172
    Why a good Anti-spam and Anti-Virus software needed?
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    Question 173
    What do you mean by type conversion? How is implicit conversion different from explicit conversion?
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    Question 174
    Define the term Byte code.
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    Question 175
    What is Malicious Code? Name the different types of Malicious Codes.
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    Question 176
    Write some reasons behind Hacking.
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    Question 177
    What is hacking?
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    Question 178
    What is Cybercrime?
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    Question 179
    What are the different types of Piracy of software?
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    Question 180
    What is BSA?
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    Question 181
    What are the two types of software? Define them.
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    Question 182
    ___________ keyword is used for dynamic allocation of an object.
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    Question 183
    Question 2
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    Question 184
    Convert the following segment into an equivalent do- while loop. int a, b; for (a = 10, b = 20; b…
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    Question 185
    What will be the output of the following program segment? int ar[] = {1, 2, 3, 4, 5}; int a = 1;…
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    Question 186
    What will be the output of the following program segment? int a[] = {1, 2, 3, 4, 5, 6, 7, 9, 13,…
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    Question 187
    i) Ramesh is trying to write a program to check whether a number is palindrome or not. Due to…
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    Question 188
    চলন কাকে বলে
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    Question 189
    প্রকরণ চলন কাকে বলে
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    Question 190
    বক্র চলন কাকে বলে
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    Question 191
    চলন গতি কাকে বলে
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    Question 192
    চলন গতি কয় প্রকার
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    Question 193
    উদ্ভিদের চলন কত প্রকার ও কি কি
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    Question 194
    Write a difference between the functions isUpperCase( ) and toUpperCase( ).
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    Question 195
    আবিষ্ট বা ট্যাকটিক চলন কাকে বলে, ট্যাকটিক চলন কাকে বলে
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    Question 196
    ট্যাকটিক চলন কয় প্রকার
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    Question 197
    ফটোট্যাকটিক চলন (Phototactic Movement)
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    Question 198
    Differentiate between the following code fragments and also give their output :- int f = 1, i = 2;…
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    Question 199
    Write the output of the following code :- String x; String str = "INFORMATION"; x =…
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    Question 200
    c) If a=24, b=15. find the value of a+=b++ * 5/a++ +b
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    Question 201
    Question 3
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    Question 202
    (h) Evaluate the following expression if the value of x=2, y=3 and z=1. &nbsp;&nbsp;v=x + --z + y++…
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    Question 203
    Declare a 2D array of integers in Java with 3 rows and 4 columns. Initialize the array with the…
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    Question 204
    What is a composite datatype? What is a user-defined datatype?
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    Question 205
    Given the following 2D array: int[][] matrix = { {5, 8, 3}, {4, 9, 7}, {6, 2, 1} }; Write a program…
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    Question 206
    Write a Java program to calculate and print the sum of all elements in the following 2D array:…
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    Question 207
    Write a Java program that takes a 2D array of size 2x3 and returns its transpose. 1 2 3 4 5 6…
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    Question 208
    Write a Java program to search for a specific element in a 2D array and print its position (row and…
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    Question 209
    Write a Java program that calculates the sum of each row in a 2D array and prints the result. Given…
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    Question 210
    Write a Java program that prints the diagonal elements of a square 2D array. Given the following…
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    Question 211
    Write a Java program to multiply two matrices. Ensure that the number of columns in the first…
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    Question 212
    Write a Java program to sort each row of the following 2D array in ascending order. Example Input:…
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    Question 213
    Write the following lava Expression :- \[ z = x^3 + y^2 - \sqrt{xy} \]
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    Question 214
    Rewrite the following code using switch case statement if (value == 1) { System.out.println("1st…
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    Question 215
    Write the Java expression for \[ (a + b)^x \]
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    Question 216
    Evaluate the expression when the value of x = 4: \[ x *= --x + x++ + x \]
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    Question 217
    Convert the following do…while loop to for loop: int x = 10; do { x––; System.out.print(x); }
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    Question 218
    What is Message Passing in OOP and why is it beneficial?
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    Question 219
    How does OOP help in real-world problem solving?
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    Question 220
    Difference between Class and Object?
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    Question 221
    What is Method Overloading? (Polymorphism)
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    Question 222
    What is Method Overriding? (Runtime Polymorphism)
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    Question 223
    What is the difference between Abstraction and Encapsulation?
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    Question 224
    Why is modularity considered a big benefit of OOP?
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    Question 225
    How does OOP support maintainability?
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    Question 226
    Why is OOP better than Procedural Programming?
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    Question 227
    What is Dynamic Binding and how is it useful?
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    Question 228
    Explain Cohesion in OOP and why it is beneficial?
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    Question 229
    Explain Coupling in OOP and its benefit?
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    Question 230
    What is the benefit of OOP in large software development?
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    Question 231
    Class is a ___________ of the objects.
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    Question 232
    What is the benefit of using Classes and Objects?
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    Question 233
    How does OOP improve security?
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    Question 234
    How does OOP improve code reusability?
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    Question 235
    Give the output of the following Character class methods: (a) Character.toUpperCase ('a') (b)…
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    Question 236
    Rewrite the following code using the if-else statement: int m = 400; double ch = (m>300) ? (m /…
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    Question 237
    Give the output of the following program segment: int n = 4279; int d; while(n > 0) { d = n % 10;…
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    Question 238
    Give the output of the following String class methods: (a) "COMMENCEMENT".lastIndexOf('M') (b)…
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    Question 239
    Consider the given array and answer the questions given below: int x[ ] = {4, 7, 9, 66, 72, 0, 16};…
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    Question 240
    Name the following: (a) What is an instance of the class called? (b) The method which has same name…
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    Question 241
    Write the value of n after execution: char ch ='d'; int n = ch + 5;
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    Question 242
    What is a datatype?
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    Question 243
    Can you refer to a class as a composite type / user-defined type?
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    Question 244
    Can every class be referred to as a user-defined datatype?
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    Question 245
    What is the main benefit of Inheritance?
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    Question 246
    What is the main benefit of Polymorphism?
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    Question 247
    What is Abstraction and what is its benefit?
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    Question 248
    What are the 4 main pillars of OOP? (Most asked)
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    Question 249
    উদ্ভিদের চলন এর উদ্দেশ্য
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    Question 250
    State the package that contains the class: BufferedReader Scanner
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    Question 251
    Write one difference between primitive data types and composite data types.
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    Question 252
    Analyze the given program segment and answer the following questions: Write the output of the…
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    Question 253
    Give the output of the following expression: a+= a++ + ++a + --a + a-- ; when a = 7
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    Question 254
    Write the return type of the following library functions: isLetterOrDigit(char) replace(char, char)
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    Question 255
    What is inheritance?
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    Question 256
    Name the operators listed below: &lt; ++ &amp;&amp; ? :
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    Question 257
    State the number of bytes occupied by char and int data types.
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    Question 258
    Write one difference between / and % operator.
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    Question 259
    String x[] = {"SAMSUNG", "NOKIA", "SONY", "MICROMAX", "BLACKBERRY"}; Give the output of the…
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    Question 260
    Name the following: A keyword used to call a package in the program. Any one reference data type.
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    Question 261
    What are the two ways of invoking functions?
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    Question 262
    State the data type and value of res after the following is executed: char ch='t'; res=…
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    Question 263
    Give the output of the following program segment and also mention the number of times the loop is…
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    Question 264
    Write the output: char ch = 'F'; int m = ch; m=m+5; System.out.println(m + " " + ch);
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    Question 265
    Write a Java expression for the following: \[ \begin{align} ax^5 + bx^3 + c \end{align} \]
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    Question 266
    What is the value of x1 if x=5? x1= ++x – x++ + --x
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    Question 267
    Convert the following while loop to the corresponding for loop: int m = 5, n = 10; while (n>=1) {…
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    Question 268
    Rewrite the following using ternary operator: if (x%2 == 0) System.out.print("EVEN"); else…
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    Question 269
    Write down java expression for: \[ \begin{align} \\ & T = \sqrt{A^2 + B^2 + C^2} \end{align} \]
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    Question 270
    Write the output of the following program code: char ch ; int x=97; do { ch=(char)x;…
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    Question 271
    Write the Java expressions for:\[ \begin{align} \\ & \frac{a^2 + b^2}{2ab} \end{align} \]
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    Question 272
    If int y = 10 then find int z = (++y * (y++ + 5));
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    Question 273
    Define Encapsulation.
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    Question 274
    What are keywords ? Give an example.
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    Question 275
    Name any two library packages.
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    Question 276
    Name the type of error ( syntax, runtime or logical error) in each case given below: Math.sqrt (36…
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    Question 277
    If int x[] = { 4, 3, 7, 8, 9, 10}; what are the values of p and q ? p = x.length q = x[2] + x[5] *…
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    Question 278
    State the difference between == operator and equals() method.
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    Question 279
    What are the types of casting shown by the following examples: char c = (char) 120; int x =…
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    Question 280
    Differentiate between formal parameter and actual parameter.
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    Question 281
    Write a function prototype of the following:A function PosChar which takes a string argument and a…
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    Question 282
    Name any two types of access specifiers.
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    Question 283
    Give the output of the following string functions: "MISSISSIPPI".indexOf('S') +…
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    Question 284
    Give the output of the following Math functions: Math.ceil(4.2) Math.abs(-4)
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    Question 285
    What is a parameterized constructor ?
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    Question 286
    Why is an object called an instance of a class?
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    Question 287
    Convert following do-while loop into for loop. int i = 1; int d = 5; do { d=d*2;…
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    Question 288
    Differentiate between constructor and function.
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    Question 289
    Write a Java expression for the following: \[ \frac{\sqrt{3x + x^2}}{a + b} \]
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    Question 290
    What is the value of y after evaluating the expression given below? y+= ++y + y-- + --y; when int…
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    Question 291
    Give the output of the following: Math.floor (-4.7) Math.ceil(3.4) + Math.pow(2, 3)
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    Question 292
    Write two characteristics of a constructor.
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    Question 293
    Write the output for the following: System.out.println("Incredible"+"\n"+"world");
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    Question 294
    Convert the following if else if construct into switch case if( var==1) System.out.println("good");…
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    Question 295
    Give the output of the following string functions: "ACHIEVEMENT".replace('E', 'A')…
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    Question 296
    Consider the following String array and give the output String arr[]= {"DELHI", "CHENNAI",…
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    Question 297
    Rewrite the following using ternary operator: if (bill > 10000 ) discount = bill * 10.0/100; else…
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    Question 298
    Question 1
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    Question 299
    (a) Write a Java expression for the following: \[ \lvert x^2 + 2xy \rvert \] (b) Write the return…
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    Question 300
    (a) Differentiate between if else if and switch-case statements (b) Give the output of the…
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    Question 301
    (a) Name any two basic principles of Object-oriented Programming. Answer Encapsulation Inheritance…
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    Question 302
    Write the return data type of the following function. endsWith() log()
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    Question 303
    Write the prototype of a function check which takes an integer as an argument and returns a…
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    Question 304
    System.out.print("BEST ");&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;System.out.println("OF LUCK"); Choose the…
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    Question 305
    Write the output for the following: String s="Today is Test"; System.out.println(s.indexOf('T'));…
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    Question 306
    What are the values stored in variables r1 and r2: double r1 = Math.abs(Math.min(-2.83, -5.83));…
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    Question 307
    Give the output of the following code: String A ="26", B="100"; String D=A+B+"200"; int x=…
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    Question 308
    Analyze the given program segment and answer the following questions: for(int i=3;i
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    Question 309
    What is the difference between the Scanner class functions next() and nextLine()?
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    Question 310
    State the difference between while and do while loop.
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    Question 311
    Define abstraction.
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    Question 312
    Differentiate between searching and sorting.
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    Question 313
    How are private members of a class different from public members?
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    Question 314
    lassify the following as primitive or non-primitive datatypes: char arrays int classes
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    Question 315
    (a) (i) int res = 'A';What is the value of res?
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    Question 316
    Give the output of the following program segment and also mention how many times the loop is…
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    Question 317
    What is a keyword? List some Java keywords.
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    Question 318
    Is Java case sensitive? What is the case for Java keywords?
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    Question 319
    What is a comment? Is the comment ignored by the compiler? How do you denote a comment line and a…
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    Question 320
    What is the statement to display a string on the console?
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    Question 321
    Show the output of the following code :
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    Question 322
    What is the Java source filename extension, and what is the Java bytecode file- name extension?
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    Question 323
    Example of Array Declaration in Different Data Types
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    Question 324
    What is the primary benefit of Encapsulation?
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    Question 325
    Why Packages are used?
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    Question 326
    What do you mean by Multi-threaded program?
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    Question 327
    What is an assembler?
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    Question 328
    What are the two ways in which Thread can be created?
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    Question 329
    What is an applet?
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    Question 330
    What is a high-level programming language?
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    Question 331
    An applet extend which class?
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    Question 332
    What is a source program?
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    Question 333
    Explain garbage collection in Java?
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    Question 334
    Define immutable object?
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    Question 335
    Explain the usage of this() with constructors?
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    Question 336
    Explain Set Interface?
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    Question 337
    Explain TreeSet?
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    Question 338
    What are multiprogramming, multithreading, and multiprocessing?
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    Question 339
    What is Comparable Interface?
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    Question 340
    Difference between throw and throws?
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    Question 341
    Who invented Java? Which company owns Java now?
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    Question 342
    Explain the following line used under Java Program ? public static void main (String args[ ])
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    Question 343
    What is a Java applet?
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    Question 344
    Define JRE i.e. Java Runtime Environment?
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    Question 345
    What programming language does Android use?
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    Question 346
    What is the Java language specification?
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    Question 347
    What is JAR file?
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    Question 348
    What is a WAR file?
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    Question 349
    Define JIT compiler?
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    Question 350
    What is the difference between object oriented programming language and object based programming…
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    Question 351
    What is the purpose of default constructor?
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    Question 352
    Can a constructor be made final?
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    Question 353
    What is static block?
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    Question 354
    What does IDE stand for?
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    Question 355
    Are tools like NetBeans and Eclipse different languages from Java, or are they dialects or…
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    Question 356
    What does JDK stand for?
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    Question 357
    If your program needs to read integers, but the user entered strings, an error wouldoccur when…
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    Question 358
    Suppose you write a program for computing the perimeter of a rectangle and you mistakenly write…
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    Question 359
    Identify and fix the errors in the following code: 1 public class Welcome { 2 public void…
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    Question 360
    What is an assembly language?
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    Question 361
    What are the input and output of a Java compiler?
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    Question 362
    What is the command to compile a Java program?
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    Question 363
    What is the command to run a Java program?
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    Question 364
    What is the JVM?
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    Question 365
    Can Java run on any machine? What is needed to run Java on a computer?
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    Question 366
    If a NoClassDefFoundError occurs when you run a program, what is the cause of the error?
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    Question 367
    If a NoSuchMethodError occurs when you run a program, what is the cause of the error?
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    Question 368
    What is the statement to display the message "Hello world" in a message dialog box?
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    Question 369
    Why does the System class not need to be imported?
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    Question 370
    Are there any performance differences between the following two import statements? import…
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    Question 371
    Reformat the following program according to the programming style and documentation guidelines. Use…
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    Question 372
    What are syntax errors (compile errors), runtime errors, and logic errors?
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    Question 373
    Give examples of syntax errors, runtime errors, and logic errors.
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    Question 374
    If you forget to put a closing quotation mark on a string, what kind error will be raised?
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    Question 375
    The following program is wrong. Reorder the lines so that the program displays morning followed by…
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    Question 376
    What do you know about Java?
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    Question 377
    Why Generics are used in Java?
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    Question 378
    What are the supported platforms by Java Programming Language?
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    Question 379
    What is the difference between a break statement and a continue statement?
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    Question 380
    Which number is denoted by leading zero in java?
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    Question 381
    List any five features of Java?
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    Question 382
    What is a transient variable?
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    Question 383
    Why is Java Architectural Neutral?
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    Question 384
    How Java enabled High Performance?
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    Question 385
    If a variable is declared as private, where may the variable be accessed?
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    Question 386
    Why Java is considered dynamic?
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    Question 387
    What happens when a variable declaration is executed? Give an example.
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    Question 388
    What is Java Virtual Machine and how it is considered in context of Java's platform independent…
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    Question 389
    Importance of variable declaration and initialization
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    Question 390
    Which Java operator is right associative?
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    Question 391
    List two Java IDE's?
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    Question 392
    What is dot operator?
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    Question 393
    List some Java keywords(unlike C, C++ keywords)?
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    Question 394
    What do you mean by Object?
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    Question 395
    What is the difference between the >> and >>> operators?
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    Question 396
    Define class?
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    Question 397
    Explain the following operators: (a) ++ (Increment Operator) (b) && (Logical AND) (c) != (Not Equal…
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    Question 398
    What kind of variables a class can consist of?
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    Question 399
    Identify the type of expression statements: aValue=8933.234; aValue++; System.out.println("Hello…
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    Question 400
    What is a Local Variable?
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    Question 401
    According to Java Operator precedence, which operator is considered to be with highest precedence?
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    Question 402
    What is a Instance Variable?
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    Question 403
    Given the value of a variable, write a statement, without using if construct, which will produce…
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    Question 404
    Question: Given the following code fragment: if (a == 0) System.out.println("Zero"); if (a == 1)…
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    Question 405
    What is a Class Variable?
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    Question 406
    What is Singleton class?
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    Question 407
    What is the problem of dangling-else?When does it arise?What is the default dangling-else matching,…
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    Question 408
    What do you mean by Constructor?
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    Question 409
    Question: Rewrite the following fragment using switch: if (ch == 'E') eastern++; if (ch == 'W')…
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    Question 410
    List the three steps for creating an Object for a class?
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    Question 411
    Variables used in a switch statement can be used with which datatypes?
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    Question 412
    Comparison between if-else if and switch-case
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    Question 413
    What is the default value of byte datatype in Java?
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    Question 414
    Write a difference between class and a object
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    Question 415
    What is the default value of float and double datatype in Java?
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    Question 416
    When a byte datatype is used?
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    Question 417
    (x) Give the output of the following program segment and specify how many times the loop is…
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    Question 418
    What is a static variable?
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    Question 419
    (iv) Convert the given loop into exit controlled loop. int a, b; for ( a=10 , b=1; a>=1 ; a-=2) {…
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    Question 420
    What do you mean by synchronized Non Access Modifier?
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    Question 421
    What do you mean by Access Modifier?
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    Question 422
    What is protected access modifier?
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    Question 423
    What is Encapsulation?
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    Question 424
    Define composition?
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    Question 425
    What is final class?
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    Question 426
    What is the purpose of the System class?
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    Question 427
    Which class is the immediate superclass of the Container class?
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    Question 428
    When parseInt() method can be used?
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    Question 429
    Why is String class considered immutable?
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    Question 430
    What is the default value of an object reference declared as an instance variable?
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    Question 431
    What is the immediate super class of Menu?
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    Question 432
    What is Nested top-level class?
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    Question 433
    What is the GregorianCalendar class?
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    Question 434
    Which package is used for pattern matching with regular expressions?
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    Question 435
    java.util.regex consists of which classes?
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    Question 436
    What is the SimpleTimeZone class?
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    Question 437
    Can a vector contain heterogenous objects?
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    Question 438
    Can a class declared as private be accessed outside it's package?
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    Question 439
    What is an Exception?
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    Question 440
    What is an object's lock and which object's have locks?
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    Question 441
    What do you mean by Checked Exceptions?
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    Question 442
    What are order of precedence and associativity and how are they used?
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    Question 443
    Explain Runtime Exceptions?
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    Question 444
    If a method is declared as protected, where may the method be accessed?
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    Question 445
    Which are the two subclasses under Exception class?
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    Question 446
    When throws keyword is used?
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    Question 447
    What is the difference between inner class and nested class?
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    Question 448
    When throw keyword is used?
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    Question 449
    What will be the default values of all the elements of an array defined as an instance variable?
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    Question 450
    How will you define a software object?
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    Question 451
    How finally used under Exception Handling?
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    Question 452
    What things should be kept in mind while creating your own exceptions in Java?
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    Question 453
    Define class and object with an example.
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    Question 454
    Why is Java called an object-oriented programming language?
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    Question 455
    What are the four key features of an object?
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    Question 456
    What is Method/function overloading?
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    Question 457
    What is Method/function overriding?
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    Question 458
    Difference between Overloading and Overriding?
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    Question 459
    What is runtime polymorphism or dynamic method dispatch?
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    Question 460
    What restrictions are placed on method overriding?
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    Question 461
    What is finalize() method?
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    Question 462
    What's the difference between constructors and other methods?
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    Question 463
    Can you call one constructor from another if a class has multiple constructors?
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    Question 464
    Can constructor be inherited?
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    Question 465
    Where and how can you use a private constructor?
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    Question 466
    What is constructor chaining and how is it achieved in Java?
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    Question 467
    What is the default constructor?
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    Question 468
    Rules for creating Java constructor
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    Question 469
    When is a constructor called
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    Question 470
    Types of Java constructors in Java
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    Question 471
    What is the purpose of a default constructor?
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    Question 472
    Why use the parameterized constructor in Java?
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    Question 473
    Difference between constructor and method in Java
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    Question 474
    Can constructor perform other tasks instead of initialization?
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    Question 475
    What is Constructor Overloading in Java?
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    Question 476
    Can a top level class be private or protected?
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    Question 477
    What is an instance method in OOP, and how does it differ from a static method?
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    Question 478
    Can instance methods access static members of a class in X++? Explain.
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    Question 479
    Why would you choose to use a static method over an instance method in OOP?
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    Question 480
    What is recursion?
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    Question 481
    What is a recursive function?
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    Question 482
    How is recursion different from a normal function call?
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    Question 483
    What is direct recursion?
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    Question 484
    What is the mathematical idea behind recursion?
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    Question 485
    Write a Java program to demonstrate recursion.
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    Question 486
    Why is the compute() method recursive? return n * compute(n - 1);
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    Question 487
    Why is a class known as composite data type?
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    Question 488
    A statement is given as: 'Study_Table' is an object of the class 'Furniture'. Write down Java…
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    Question 489
    Class and Objects are inter-related. Explain.
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    Question 490
    Why is an Object called an 'Instance' of a class? Explain.
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    Question 491
    Write a statement to create an object 'Keyboard' of the class 'Computer'.
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    Question 492
    What is NullPointerException?
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    Question 493
    Mention three characteristics and two methods for the following Classes: (a) class Mobile Phone (b)…
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    Question 494
    What are the ways in which a thread can enter the waiting state?
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    Question 495
    Design a program in Java to calculate the discount given to a customer on purchasing LED…
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    Question 496
    How does multi-threading take place on a computer with a single CPU?
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    Question 497
    Define Inheritance?
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    Question 498
    What invokes a thread's run() method?
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    Question 499
    Does it matter in what order catch statements for FileNotFoundException and IOException are written?
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    Question 500
    When super keyword is used?
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    Question 501
    Is there any limitation of using Inheritance?
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    Question 502
    What is the difference between yielding and sleeping?
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    Question 503
    How inheritance supports reusability?
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    Question 504
    Write the general syntax of inheritance.
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    Question 505
    Attributes, Fields, Properties, Member Variables, Instance Variables, Object Variables, and Class…
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    Question 506
    What are Wrapper classes?
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    Question 507
    What is the difference between a Window and a Frame?
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    Question 508
    What is an Interface?
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    Question 509
    Which package has light weight components?
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    Question 510
    Give some features of Interface?
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    Question 511
    What is a finally block? When and how is it used? Give an example.
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    Question 512
    What is the difference between the paint() and repaint() methods?
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    Question 513
    What is the purpose of File class?
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    Question 514
    Name the block that encloses the code that may encounter anomalous situations.
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    Question 515
    What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream…
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    Question 516
    In which block can you throw the exception?
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    Question 517
    Which class should you use to obtain design information about an object?
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    Question 518
    Which block traps and handles an exception?
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    Question 519
    Can one catch block sufficiently trap and handle multiple exceptions?
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    Question 520
    What is the difference between static and non-static variables?
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    Question 521
    What is Serialization and deserialization?
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    Question 522
    Which block is always executed no matter which exception is thrown?
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    Question 523
    NumberFormatException is subclass of which exception class?
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    Question 524
    What are use cases?
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    Question 525
    IOException is subclass of which exception class?
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    Question 526
    Explain the use of sublass in a Java program?
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    Question 527
    How to add menushortcut to menu item?
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    Question 528
    What is the role of (i) throws keyword ? (ii) throw keyword ?
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    Question 529
    Why is exception handling necessary?
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    Question 530
    Can you write a Java class that could be used both as an applet as well as an application?
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    Question 531
    What is the difference between Swing and AWT components?
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    Question 532
    How do you throw an exception?
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    Question 533
    How do you handle an exception? Describe the keyword try. How is it used?
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    Question 534
    What is the root class for all exceptions?
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    Question 535
    What type of exceptions require the caller to explicitly handle them?
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    Question 536
    When is the ArrayStoreException thrown?
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    Question 537
    What type of exceptions do not require the caller to explicitly handle them?
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    Question 538
    What is the throws keyword, and how does it differ from the throw keyword?
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    Question 539
    What's the difference between the methods sleep() and wait()?
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    Question 540
    Which of the following code fragments will throw an ArrayIndexOutOfBoundsException?
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    Question 541
    Which code fragment will throw an ArrayIndexOutOfBoundsException?
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    Question 542
    What is synchronization?
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    Question 543
    Write a try/catch block that throws an Exception if the value of variable X is less than zero. The…
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    Question 544
    What is the Collections API?
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    Question 545
    What line of a given program will throw FileNotFoundException?
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    Question 546
    Create a try block that can generate three types of exceptions and handle them with multiple catch…
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    Question 547
    Does garbage collection guarantee that a program will not run out of memory?
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    Question 548
    When ArithmeticException is thrown?
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    Question 549
    The immediate super class of the Applet class?
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    Question 550
    What class of exceptions are generated by the Java run-time system?
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    Question 551
    Which arithmetic operations can result in the throwing of an ArithmeticException?
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    Question 552
    Variable of the boolean type is automatically initialized as?
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    Question 553
    What is the difference between error and an exception?
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    Question 554
    List primitive Java types?
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    Question 555
    Write general syntax of try-catch block
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    Question 556
    What is an Exception in Java?
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    Question 557
    What is the relationship between clipping and repainting under AWT?
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    Question 558
    How Java Handles Exceptions
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    Question 559
    Types of Exceptions
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    Question 560
    Example: IOException
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    Question 561
    Under what conditions is an object's finalize() method invoked by the garbage collector?
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    Question 562
    Example: ArithmeticException
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    Question 563
    How can a dead thread be restarted?
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    Question 564
    Example: NullPointerException
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    Question 565
    Example: ArrayIndexOutOfBoundsException
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    Question 566
    Example: NumberFormatException
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    Question 567
    What are ClassLoaders?
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    Question 568
    Example: StackOverflowError
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    Question 569
    Example: OutOfMemoryError
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    Question 570
    What are the types of program errors?
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    Question 571
    What will happen if static modifier is removed from the signature of the main method?
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    Question 572
    When is Exception Handling required?
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    Question 573
    What is the function of the catch block in exception handling? Where does it appear in a program?…
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    Question 574
    What are the advantages of exception handling?
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    Question 575
    Why do we need wrapper classes?
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    Question 576
    Advantages of Exception Handling
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    Question 577
    Why do you need multiple catch handlers?
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    Question 578
    When a thread is created and started, what is its initial state?
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    Question 579
    What is wrong with this fragment?
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    Question 580
    The finally block is the last bit of code executed before your program ends. True or False? Explain.
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    Question 581
    What is the Locale class?
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    Question 582
    What are synchronized methods and synchronized statements?
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    Question 583
    What type of exceptions must be explicitly declared in a throws clause of a method?
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    Question 584
    What are the two direct subclasses of the Throwable class?
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    Question 585
    What are the three ways that an exception can be generated?
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    Question 586
    What is Dynamic Binding(late binding)?
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    Question 587
    What happens when you run a program that creates an array of ints and then sets a value beyond its…
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    Question 588
    What is the purpose of the finally clause in a try-catch-finally statement?
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    Question 589
    What are the advantages of ArrayList over arrays?
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    Question 590
    Why deletion in LinkedList is fast than ArrayList?
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    Question 591
    What classes of exceptions may be caught by a catch clause?
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    Question 592
    How do you decide when to use ArrayList and LinkedList?
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    Question 593
    Can an exception be rethrown?
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    Question 594
    What class of exceptions are generated by the Java run-time system?
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    Question 595
    What happens if a try-catch-finally statement does not have a catch clause to handle an exception…
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    Question 596
    How does a try statement determine which catch clause should be used to handle an exception?
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    Question 597
    What is the difference between Exception and Error?
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    Question 598
    What is type casting?
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    Question 599
    What is the difference between throw and throws clause?
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    Question 600
    Describe life cycle of thread?
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    Question 601
    What would be printed by the following code segment if someValue equals 1000?
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    Question 602
    Which method of the Component class is used to set the position and size of a component?
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    Question 603
    What are program errors? What are the types of program errors?
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    Question 604
    What is the range of the short type?
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    Question 605
    How are compile-time errors different from run-time errors?
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    Question 606
    What are the types of compile-time errors?
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    Question 607
    What are logical errors? Why are they hard to find?
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    Question 608
    Does Java allow Default Arguments?
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    Question 609
    How will you handle compile-time errors?
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    Question 610
    Which number is denoted by leading 0x or 0X in java?
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    Question 611
    How will you handle logical errors?
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    Question 612
    Can try statements be nested?
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    Question 613
    Break statement can be used as labels in Java?
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    Question 614
    Is it necessary that each try block must be followed by a catch block?
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    Question 615
    Where import statement is used in a Java program?
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    Question 616
    Explain suspend() method under Thread class.
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    Question 617
    How does a try statement determine which catch clause should be used to handle an exception?
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    Question 618
    Explain isAlive() method under Thread class?
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    Question 619
    What do you mean by try-catch block?
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    Question 620
    What is currentThread()?
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    Question 621
    What is the difference between byte oriented IO and character oriented IO ? How are these two…
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    Question 622
    Explain main thread under Thread class execution?
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    Question 623
    What is an exception ?
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    Question 624
    Life cycle of an applet includes which steps?
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    Question 625
    When is Exception Handling required ?
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    Question 626
    Why is the role of init() method under applets?
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    Question 627
    What is the function of catch block in exception handling ? Where does it appear in a program ?
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    Question 628
    What are the advantages of exception handling ?
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    Question 629
    Which method is called by Applet class to load an image?
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    Question 630
    When do use need multiple catch handlers ?
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    Question 631
    Define code as an attribute of Applet?
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    Question 632
    Differentiate between String and StringBuffer objects.
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    Question 633
    Define canvas?
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    Question 634
    Given a package named EDU.Student, how would you import a class named Test contained in this…
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    Question 635
    Define Network Programming?
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    Question 636
    What is a Socket?
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    Question 637
    There are three classes that implement the DataInput and DataOutput interfaces. Two of them are…
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    Question 638
    Advantages of Java Sockets?
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    Question 639
    What will be the output of the following code snippet when combined with suitable declarations and…
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    Question 640
    Disadvantages of Java Sockets?
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    Question 641
    Give the output of the following program
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    Question 642
    Which class is used by server applications to obtain a port and listen for client requests?
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    Question 643
    Consider the following try .... catch block:
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    Question 644
    Which class represents the socket that both the client and server use to communicate with each…
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    Question 645
    What is the output of the following code fragment if "abc" is passed as argument to the func( ) ?
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    Question 646
    Predefined classes are available in the form of _________.
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    Question 647
    What environment variables do I need to set on my machine in order to be able to run Java programs?
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    Question 648
    Name the package you need to import for performing input and output.
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    Question 649
    Is there any need to import java.lang package?
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    Question 650
    Which streams are by default available in a Java program?
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    Question 651
    Which class stores the information about the connection between an input device and the computer or…
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    Question 652
    What is Externalizable interface?
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    Question 653
    Name the class that translates data bytes received from InputStream objects into a stream of…
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    Question 654
    If System.exit (0); is written at the end of the try block, will the finally block still execute?
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    Question 655
    Which class buffers the input received from an InputStreamReader object?
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    Question 656
    What is daemon thread?
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    Question 657
    Which package is by default imported in every Java program?
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    Question 658
    Which method is used to create the daemon thread?
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    Question 659
    Name the block that encloses the code that may encounter anomalous situations.
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    Question 660
    Which method must be implemented by all threads?
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    Question 661
    In which block can you throw the exception?
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    Question 662
    Which block traps and handles an exception?
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    Question 663
    Can one catch block sufficiently trap and handle multiple exceptions?
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    Question 664
    Which block is always executed no matter which exception is thrown?
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    Question 665
    What is the difference between the size and capacity of a Vector?
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    Question 666
    NumberFormatException is subclass of which exception class?
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    Question 667
    What is an enumeration?
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    Question 668
    IOException is subclass of which exception class?
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    Question 669
    What is the role of(i) throws keyword?(ii) throw keyword?
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    Question 670
    What is difference between Path and Classpath?
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    Question 671
    Why is exception handling necessary?
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    Question 672
    Difference between equals() and equalsIgnoreCase() string functions?
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    Question 673
    What are the restriction imposed on a static method or a static block of code?
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    Question 674
    Difference between length() and capacity() string functions?
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    Question 675
    Can an Interface extend another Interface?
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    Question 676
    The default package is a package without any name and is imported for you.
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    Question 677
    Which object oriented Concept is achieved by using overloading and overriding?
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    Question 678
    Which command creates a package in Java?
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    Question 679
    How many bits are used to represent Unicode, ASCII, UTF-16, and UTF-8 characters?
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    Question 680
    What is Downcasting?
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    Question 681
    What is the difference between StringBuffer and StringBuilder class?
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    Question 682
    Why is StringBuffer called mutable?
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    Question 683
    Why Vector class is used?
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    Question 684
    What is a Values Collection View ?
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    Question 685
    What is Polymorphism?
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    Question 686
    Can a double value be cast to a byte?
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    Question 687
    Discuss polymorphism using real-life example.
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    Question 688
    What is Abstraction?
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    Question 689
    What is Abstract class?
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    Question 690
    What is the numerical range of a char data type in Java?
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    Question 691
    When Abstract methods are used?
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    Question 692
    What is the difference between an Interface and an Abstract class?
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    Question 693
    Define Packages in Java?
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    Question 694
    What are the supported platforms by Java Programming Language?
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