Java Basic Programs for Beginners

Java Basic Programs for Beginners - Important Points

26.		Which of the following is a valid way to declare a constant in Java?

A. final int var = 5;

B. int const var = 5;

C. const int var = 5;

D. int var = 5; final

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Answer: option a

Explanation:

Option A is a valid way to declare a constant in Java using the final keyword.

27.		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); } }

27.

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. 5

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Answer: option b

Explanation:

The / operator performs integer division when both operands are integers, so the result is 2 in this case.

28.		Which of the following is a valid way to declare and initialize a char variable in Java?

A. char var = 'a';

B. char var = "a";

C. char var = 97;

D. char var = 'a'.toUpperCase();

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Answer: option a

Explanation:

Option A is a valid way to declare and initialize a char variable in Java using single quotes.

29.		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); } }

29.

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. 1

B. 0

C. Compile error

D. Runtime error

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Answer: option b

Explanation:

The expression x == y compares the values of x and y for equality, which is false in this case.

30.		Which of the following is not a valid way to declare and initialize an integer array in Java?

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

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

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

D. int[] arr = new int[3]; arr[0] = 1; arr[1] = 2; arr[2] = 3;

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Answer: option c

Explanation:

Option C is not a valid way to declare and initialize an integer array in JavWhen using the new operator to create an array, the size of the array must be specified without initializing the elements.

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