333+ Java Interview MCQ Questions and Answers with Explanations

Q:

X implements Y, Z

Arguments:

1. X should be class
2. Y, Z should be interfaces

A) Only 1 is true	B) Only 2 is true
C) Both 1 and 2 are true	D) None

Answer & Explanation Answer: C) Both 1 and 2 are true

Explanation:

Both the statements are true

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Q:

public abstract class Shape {

private int x;

private int y;

public abstract void draw();

public void setAnchor(int x, int y) {

this.x = x;

this.y = y;

}

Which two classes use the Shape class correctly?

A) public class Circle implements Shape { private int radius;	B) public abstract class Circle extends Shape { private int radius; }
C) public class Circle extends Shape { private int radius; public void draw();	D) None

Answer & Explanation Answer: B) public abstract class Circle extends Shape { private int radius; }

Explanation:

Only B is true

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Q:

Which of the following statements are equal for a variable declared in the interface ?

1. int X=10
2. public int X=10
3. public static final int X=10

A) Only 1 and 2 are equal	B) Only 2 and 3 are equal
C) All are unequal	D) All are equal

Answer & Explanation Answer: D) All are equal

Explanation:

All the statements are equal because inside an interface a variable declared will be public static final by default

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Q:

How many of the following will follow JavaBean Listener naming rules?

addListener

addMouseListener

deleteMouseListener

removeMouseListener

registerMouseListener

A) 1	B) 2
C) 3	D) 4

Answer & Explanation Answer: B) 2

Explanation:

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Q:

A lock can be acquired on a class.

The above statement is

A) True	B) False
C) Both A and B	D) None

Answer & Explanation Answer: A) True

Explanation:

A lock can be acquired on a class. This lock is acquired on the class's Class object.

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Q:

Javascript is interpreted by

A) Server	B) Object
C) Client	D) None of the above

Answer & Explanation Answer: C) Client

Explanation:

JavaScript is an interpreted language, not a compiled language. A program such as C++ or Java needs to be compiled before it is run.

The source code is passed through a program called a compiler, which translates it into bytecode that the machine understands and can execute.

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Q:

Which of the following are capabilities of functions in JavaScript?

A) Accept parameters	B) Return a value
C) Accept parameters and Return a value	D) None of the above

Answer & Explanation Answer: A) Accept parameters

Explanation:

Accept parameters are capabilities of functions in JavaScript.

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Q:

Which of the following is not a keyword?

A) assert	B) pass
C) eval	D) nonlocal

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