Java Basic Programs for Beginners

Java Basic Programs for Beginners - Important Points

36.		Which of the following is a valid way to declare and initialize a character array in Java?

A. char[] arr = {'a', 'b', 'c'};

B. char[] arr = new char[]{'a', 'b', 'c'};

C. char[] arr = new char[3]{'a', 'b', 'c'};

D. char[] arr = new char[3]; arr[0] = 'a'; arr[1] = 'b'; arr[2] = 'c';

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Answer: option b

Explanation:

Option B is a valid way to declare and initialize a character array in Java using the new operator.

37.		What is the output of the following program? public class Main { public static void main(String[] args) { int x = 5; int y = 2; System.out.println(x / y); } }

37.

What is the output of the following program?

public class Main {
public static void main(String[] args) {
int x = 5;
int y = 2;
System.out.println(x / y);
}
}

A. 2.5

B. 2

C. 3

D. 1

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Answer: option b

Explanation:

The / operator performs integer division on the two operands, which is 2 in this case.

38.		Which of the following is a valid way to declare and initialize a two-dimensional integer array in Java?

A. int[][] arr = {{1, 2, 3}, {4, 5, 6}};

B. int[][] arr = new int[][]{{1, 2, 3}, {4, 5, 6}};

C. int[][] arr = new int[2][3]{{1, 2, 3}, {4, 5, 6}};

D. int[][] arr = new int[2][3]; arr[0] = {1, 2, 3}; arr[1] = {4, 5, 6};

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Answer: option b

Explanation:

Option B is a valid way to declare and initialize a two-dimensional integer array in Java using the new operator.

39.		What is the output of the following program? public class Main { public static void main(String[] args) { String str = "Hello, world!"; System.out.println(str.toUpperCase()); } }

39.

What is the output of the following program?

public class Main {
public static void main(String[] args) {
String str = "Hello, world!";
System.out.println(str.toUpperCase());
}
}

A. HELLO, WORLD!

B. Hello, world!

C. hello, world!

D. hELLO, WORLD!

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Answer: option a

Explanation:

The toUpperCase method returns a new string in which all the alphabetic characters have been converted to uppercase, which is "HELLO, WORLD!" in this case.

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