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Question Result 1941

(a) Differentiate between if else if and switch-case statements (b) Give the output of the following code: String P = "20", Q ="19"; int a = Integer.parseInt(P); int b = Integer.valueOf(Q); System.out.println(a+""+b); (c) What are the various types of errors in Java? (d) State the data type and value of res after the following is executed: char ch = '9'; res= Character.isDigit(ch); (e) What is the difference between the linear search and the binary search technique?

Answer (a) if else if switch-case if else if can test for any Boolean expression like less than, greater than, equal to, not equal to, etc. switch-case can only test if the expression is equal to any of its case constants. if else if can use different expressi...

/question/8154

Question Result 1942

(a) Write a Java expression for the following: \[ \lvert x^2 + 2xy \rvert \] (b) Write the return data type of the following functions: startsWith() random() (c) If the value of basic=1500, what will be the value of tax after the following statement is executed? tax = basic > 1200 ? 200 :100; (d) Give the output of following code and mention how many times the loop will execute? int i; for( i=5; i>=1; i--) { if(i%2 == 1) continue; System.out.print(i+" "); } (e) State a difference between call by value and call by reference. (f) Give the output of the following: Math.sqrt(Math.max(9,16)) (g) Write the output for the following: String s1 = "phoenix"; String s2 ="island"; System.out.println(s1.substring(0).concat(s2.substring(2))); System.out.println(s2.toUpperCase()); (h) Evaluate the following expression if the value of x=2, y=3 and z=1. v=x + --z + y++ + y (i) String x[] = {"Artificial intelligence", "IOT", "Machine learning", "Big data"}; Give the output of the following statements: System.out.println(x[3]); System.out.println(x.length); (j) What is meant by a package? Give an example.

Answer (a) Math.abs(x * x + 2 * x * y) Answer (b) boolean double Answer (c) Value of tax will be 200. As basic is 1500, the condition of ternary operator — basic > 1200 is true. 200 is returned as the result of ternary operator and it gets assigned to tax. A...

/question/8155

Question Result 1943

(ix)(a) Write the Java statement to initialize the first 6 odd numbers in a 3 × 2 array. (b) What is the result of x[0][1] + x[2][1] of the above array?

(a) Java statement to initialize the first 6 odd numbers in a 3 × 2 array: int[][] x = { {1, 3}, {5, 7}, {9, 11} }; (b) Calculation of x[0][1] + x[2][1]: x[0][1] refers to the element at row 0, column 1, which is 3. x[2][1] refers to the element at row 2, colu...

/question/8482

Question Result 1944

(x) Give the output of the following program segment and specify how many times the loop is executed. String s = "JAVA"; for(i=0; i

Understanding the Code The given Java program prints substrings of the string "JAVA" based on the loop conditions. String s = "JAVA"; for(i=0; i

/question/8483

Question Result 1945

State the package that contains the class: BufferedReader Scanner

java.io java.util

/question/7791

Question Result 1946

What is the value of y after evaluating the expression given below? y+= ++y + y-- + --y; when int y=8

y+= ++y + y-- + --y⇒ y = y + (++y + y-- + --y)⇒ y = 8 + (9 + 9 + 7)⇒ y = 8 + 25⇒ y = 33 Practice With Code Let's analyze and implement the Java program to evaluate the given expression: Expression: y += ++y + y-- + --y; Given int y = 8, let's break it down ...

/question/8144

Question Result 1947

Write the Java expressions for:\[ \begin{align} \\ & \frac{a^2 + b^2}{2ab} \end{align} \]

(a * a + b * b) / (2 * a * b)

/question/7793

Question Result 1948

Declare a 2D array of integers in Java with 3 rows and 4 columns. Initialize the array with the following values: 1 2 3 4 5 6 7 8 9 10 11 12

Write a Java program to print all the elements of the array.: public class Main { public static void main(String[] args) { int[][] array = { {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12} }; for (int i = 0; i < array.length; i++) { for (int j = 0; j < array[i].le...

/question/8216

Question Result 1949

Give the output of the following Character class methods: (a) Character.toUpperCase ('a') (b) Character.isLetterOrDigit('#')

(a) Character.toUpperCase ('a') Output A Explanation In Java, the Character.toUpperCase(char ch) method is used to convert a given character to its uppercase equivalent, if one exists. So, the output is uppercase 'A'. (b) Character.isLetterOrDigit('#') Output ...

/question/8388

Question Result 1950

i) Ramesh is trying to write a program to check whether a number is palindrome or not. Due to confusion in the syntax of some of the statements. he could not complete the program and has left some places blank marked with ?1?, ?2?, ?3? and ?4? to be filled with expression function. The incomplete program is shown below: Based on the above discussion. answer the following questions :- a) What expression will be filled in place of ?1? b) What expression will be filled in place of ?2? c) What expression will be filled in place of ?3? d) What expression will be filled in place of ?4? import java.util.*; class Palindrome { public static void main(String args[]) { Scanner sc = new Scanner(System.in); int copy, n, rev = 0; System.out.println("Enter the number"); n = sc.nextInt(); copy = n; while (n != 0) { int r = ?1?; // Place 1 rev = ?2?; // Place 2 n = ?3?; // Place 3 } if (?4?) { // Place 4 System.out.println("Palindrome"); } else { System.out.println("Not palindrome"); } } }

import java.util.*; class Palindrome { public static void main(String args[]) { Scanner sc = new Scanner(System.in); int copy, n, rev = 0; System.out.println("Enter the number"); n = sc.nextInt(); copy = n; while (n != 0) { int r = n % 10; // Extract the last ...

/question/8347

Question Result 1951

What is the problem of dangling-else?When does it arise?What is the default dangling-else matching, and how can it be overridden?

Question: What is the problem of dangling-else?When does it arise?What is the default dangling-else matching, and how can it be overridden? Answer: 🧩 Definition: The dangling-else problem occurs in nested if statements when it is unclear which if a particular ...

/question/8679

Question Result 1952

Write a Java program that calculates the sum of each row in a 2D array and prints the result. Given the following array: int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };

public class Main { public static void main(String[] args) { int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} }; for (int i = 0; i < arr.length; i++) { int rowSum = 0; for (int j = 0; j < arr[i].length; j++) { rowSum += arr[i][j]; } System.out.println("Row " + ...

/question/8221

Question Result 1953

Write a Java program that prints the diagonal elements of a square 2D array. Given the following array: int[][] matrix = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };

public class Main { public static void main(String[] args) { int[][] matrix = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} }; System.out.print("Diagonal Elements: "); for (int i = 0; i < matrix.length; i++) { System.out.print(matrix[i][i] + " "); } } }

/question/8222

Question Result 1954

Write a Java program that takes a 2D array of size 2x3 and returns its transpose. 1 2 3 4 5 6 Output: 1 4 2 5 3 6

public class Main { public static void main(String[] args) { int[][] matrix = { {1, 2, 3}, {4, 5, 6} }; int[][] transpose = new int[3][2]; for (int i = 0; i < matrix.length; i++) { for (int j = 0; j < matrix[i].length; j++) { transpose[j][i] = matrix[i][j]; } ...

/question/8219

Question Result 1955

Write a Java program to calculate and print the sum of all elements in the following 2D array: int[][] arr = { {2, 4, 6}, {1, 3, 5}, {7, 8, 9} };

public class Main { public static void main(String[] args) { int[][] arr = { {2, 4, 6}, {1, 3, 5}, {7, 8, 9} }; int sum = 0; for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr[i].length; j++) { sum += arr[i][j]; } } System.out.println("Sum of all e...

/question/8218

Question Result 1956

Write a Java program to multiply two matrices. Ensure that the number of columns in the first matrix is equal to the number of rows in the second matrix. Given matrices: Matrix A (2x3): 1 2 3 4 5 6 Matrix B (3x2): 7 8 9 10 11 12

public class Main { public static void main(String[] args) { int[][] matrixA = { {1, 2, 3}, {4, 5, 6} }; int[][] matrixB = { {7, 8}, {9, 10}, {11, 12} }; int[][] result = new int[2][2]; for (int i = 0; i < matrixA.length; i++) { for (int j = 0; j < matrixB[0]....

/question/8223

Question Result 1957

Write a Java program to search for a specific element in a 2D array and print its position (row and column index). If the element is not found, print a message indicating that the element was not found. Given the following 2D array: int[][] arr = { {5, 7, 9}, {4, 6, 8}, {1, 2, 3} };

public class Main { public static void main(String[] args) { int[][] arr = { {5, 7, 9}, {4, 6, 8}, {1, 2, 3} }; int searchElement = 6; boolean found = false; for (int i = 0; i < arr.length; i++) { for (int j = 0; j < arr[i].length; j++) { if (arr[i][j] == sear...

/question/8220

Question Result 1958

Write a Java program to sort each row of the following 2D array in ascending order. Example Input: 9 7 5 3 1 2 6 4 8 Expected Output: 5 7 9 1 2 3 4 6 8

Here is the Java program to sort each row of a 2D array in ascending order: import java.util.Arrays; public class RowWiseSorting { public static void main(String[] args) { int[][] array = { {9, 7, 5}, {3, 1, 2}, {6, 4, 8} }; System.out.println("Original 2D Arr...

/question/8224

Question Result 1959

Name the Java keyword that: indicates that a method has no return type. stores the address of the currently-calling object.

void this

/question/7743

Question Result 1960

[Inheritance] Based on the given image, write the Java statement to create the class Child.

The correct Java statement is: class Child implements Father, Mother { } Understanding the Diagram: The image shows: Two interfaces: Father and Mother One class: Child The class Child is connected to both interfaces This represents: Multiple Inheritance using ...

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