TCS Core Java Questions - Quiz

What will be the output?

public class Test{
	static{
		int a = 5;
	}

	public static void main(String args[]){
		new Test().call();
	}

	void call(){
		this.a++;
		System.out.print(this.a);
	}
}

ACompile with error
BRuntime Exception
C5
D6

Which of the following loops runs without any condition and runs infinitely?

Ado while, for loop
Bwhile loop
Cfinite loop
Dinfinite loop

Java allows you to control access to classes, methods, and fields via specifiers.

Acontrol
Bjava
Caccess
Dstandard

The _____ keyword basically says to the JVM "Warning, this variable may be modified in another Thread".

Athis
Bsuper
Cnew
Dvolatile

________ interface needs to be implemented for making object copies.

Acut
Bset
Ccloneable
Dcarbon

The ______ is achieved by combining the methods and attribute into a class.

AAbstraction
BEncapsulation
CComposition
DPolymorphism

Iterators are a generic way to go through all the elements of a ______ no matter how it is organized.

Aliststack
Bcontainer
Carray
Dcollection

Java uses ______ data types and hence is not a pure OOP.

Abuilt in, dynamic
Bstatic
Cprimitive
Dstandard

The Conditional operator are called as_____.

ASingleton operator, Binary operator
BSecondary Operator
CPrimary operator
DTernary Operator

The _______ keyword is used to declare an interface.

Aint, inter
Bstatic
Cinterface
Dthis

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TCS Core Java Questions - Quiz

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Q: What will be the output?

public class Test{
	static{
		int a = 5;
	}

	public static void main(String args[]){
		new Test().call();
	}

	void call(){
		this.a++;
		System.out.print(this.a);
	}
}

A. Compile with error
B. Runtime Exception
C. 5
D. 6

Correct Option: A
Remarks:

Explanation: Compile with error

Q: Which of the following loops runs without any condition and runs infinitely?

A. do while, for loop
B. while loop
C. finite loop
D. infinite loop

Correct Option: D
Remarks:

Explanation:

The correct option is:

infinite loop

An infinite loop runs continuously without any condition to terminate. Examples of such loops in Java include while(true) or for(;;). The other loops, like do while, for, and while, typically have conditions that can terminate them.

Q: Java allows you to control access to classes, methods, and fields via specifiers.

A. control
B. java
C. access
D. standard

Correct Option: C
Remarks:

Explanation:

The correct option is:

access

Java uses access specifiers (also known as access modifiers) to control the visibility of classes, methods, and fields. These include public, private, protected, and the default (package-private) access level.

Q: The _____ keyword basically says to the JVM "Warning, this variable may be modified in another Thread".

A. this
B. super
C. new
D. volatile

Correct Option: D
Remarks:

Explanation:

The correct option is:

volatile

In Java, the volatile keyword tells the JVM that a variable's value may be modified by multiple threads, ensuring that the most up-to-date value of the variable is always read by the threads.

Q: ________ interface needs to be implemented for making object copies.

A. cut
B. set
C. cloneable
D. carbon

Correct Option: C
Remarks:

Explanation:

The correct option is:

cloneable

The Cloneable interface needs to be implemented in a class to allow objects to be copied (cloned) using the clone() method in Java.

Q: The ______ is achieved by combining the methods and attribute into a class.

A. Abstraction
B. Encapsulation
C. Composition
D. Polymorphism

Correct Option: B
Remarks:

Explanation:

The correct option is:

Encapsulation

Encapsulation is the concept of bundling data (attributes) and methods (functions) that operate on the data into a single unit, known as a class, in object-oriented programming.

Q: Iterators are a generic way to go through all the elements of a ______ no matter how it is organized.

A. liststack
B. container
C. array
D. collection

Correct Option: D
Remarks:

Explanation:

The correct option is:

collection

Iterators provide a generic way to traverse through all the elements of a collection (such as lists, sets, etc.) regardless of how the elements are organized.

Q: Java uses ______ data types and hence is not a pure OOP.

A. built in, dynamic
B. static
C. primitive
D. standard

Correct Option: C
Remarks:

Explanation:

The correct option is:

primitive

Java uses primitive data types (such as int, char, boolean, etc.), which are not objects. This is why Java is not considered a pure object-oriented programming language.

Q: The Conditional operator are called as_____.

A. Singleton operator, Binary operator
B. Secondary Operator
C. Primary operator
D. Ternary Operator

Correct Option: D
Remarks:

Explanation:

The correct option is:

Ternary Operator

The ternary operator in Java is a conditional operator that takes three operands and is used as a shorthand for an if-else statement. Its syntax is: condition ? expression1 : expression2.

Q: The _______ keyword is used to declare an interface.

A. int, inter
B. static
C. interface
D. this

Correct Option: C
Remarks:

Explanation:

The correct option is:

interface

The interface keyword is used in Java to declare an interface.

TCS Core Java Questions - Quiz

What will be the output? public class Test{ static{ int a = 5; } public static void main(String args[]){ new Test().call(); } void call(){ this.a++; System.out.print(this.a); } }

Which of the following loops runs without any condition and runs infinitely?

Java allows you to control access to classes, methods, and fields via specifiers.

The _____ keyword basically says to the JVM "Warning, this variable may be modified in another Thread".

________ interface needs to be implemented for making object copies.

The ______ is achieved by combining the methods and attribute into a class.

Iterators are a generic way to go through all the elements of a ______ no matter how it is organized.

Java uses ______ data types and hence is not a pure OOP.

The Conditional operator are called as_____.

The _______ keyword is used to declare an interface.

What will be the output?
public class Test{ static{ int a = 5; } public static void main(String args[]){ new Test().call(); } void call(){ this.a++; System.out.print(this.a); } }