Java Basics

Java Basics - Important Points

26.		Which of the following is NOT a loop in Java?

A. while

B. for

C. do-while

D. if

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Answer: option d

Explanation:

If is a conditional statement, not a loop.

27.		What is the output of the following code? public class Test { public static void main(String args[]) { int x = 10; if(x > 5 && x < 15) { System.out.println("x is between 5 and 15"); } else { System.out.println("x is not between 5 and 15"); } } }

27.

What is the output of the following code?

public class Test {
public static void main(String args[]) {
int x = 10;
if(x > 5 && x < 15) {
System.out.println("x is between 5 and 15");
} else {
System.out.println("x is not between 5 and 15");
  }
 }
}

A. x is between 5 and 15

B. x is not between 5 and 15

C. 5 and 15

D. No output

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Answer: option a

Explanation:

The condition x > 5 && x < 15 is true, so the output is "x is between 5 and 15".

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

A. int x = 5;

B. int 5 = x;

C. x = 5;

D. int x;

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Answer: option a

Explanation:

Option A shows the correct syntax for declaring and initializing a variable in Java.

29.		What is the output of the following program? public class Test { public static void main(String args[]) { int x = 10; int y = x++; System.out.println(y); } }

29.

What is the output of the following program?

public class Test {
public static void main(String args[]) {
int x = 10;
int y = x++;
System.out.println(y);
}
}

A. 10

B. 11

C. 9

D. None of the above

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Answer: option a

Explanation:

The post-increment operator (++) increases the value of x after it has been assigned to y. In this case, y is assigned the value of 10 before x is incremented to 11.

30.		Which of the following is NOT a valid way to create an object in Java?

A. MyClass object = new MyClass();

B. MyClass object = MyClass();

C. MyClass object;

D. MyClass object = null;

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Answer: option b

Explanation:

Option B is not a valid way to create an object in JavThe correct syntax for creating an object is to use the "new" keyword.

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