Java Basic Programs for Beginners

Java Basic Programs for Beginners - Important Points

21.		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); } }

21.

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

B. 3

C. 5

D. 7

View Answer Discuss Work Space

Answer: option d

Explanation:

The + operator performs addition on the two operands, which is 7 in this case.

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

A. boolean var = "true";

B. boolean var = 1;

C. boolean var = true;

D. boolean var = True;

View Answer Discuss Work Space

Answer: option c

Explanation:

Option C is a valid way to declare and initialize a boolean variable in Java.

23.		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); } }

23.

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

B. 3

C. 5

D. 10

View Answer Discuss Work Space

Answer: option d

Explanation:

The * operator performs multiplication on the two operands, which is 10 in this case.

24.		Which of the following is not a valid way to declare and initialize a String variable in Java?

A. String var = "hello";

B. String var = new String("hello");

C. String var = 'hello';

D. String var = "hello".toUpperCase();

View Answer Discuss Work Space

Answer: option c

Explanation:

Option C is not a valid way to declare and initialize a String variable in JavStrings are enclosed in double quotes, not single quotes.

25.		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); } }

25.

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

B. 3

C. 5

D. -3

View Answer Discuss Work Space

Answer: option c

Explanation:

The - operator performs subtraction on the two operands, which is 3 in this case.

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