333+ Java Interview MCQ Questions and Answers with Explanations

Q:

What is the output of this program ?

class main_arguments {
            public static void main(String [ ] args)
            {
                String [][] argument = new String[2][2];
                int x;
                argument[0] = args;
                x = argument[0].length;
                for (int y = 0; y < x; y++)
                    System.out.print(" " + argument[0][y]);
            }
        }

A) 1 1	B) 1 0
C) 1 0 3	D) 1 2 3

Answer & Explanation Answer: D) 1 2 3

Explanation:

In argument[0] = args;, the reference variable arg[0], which was referring to an array with two elements, is reassigned to an array (args) with three elements.
Output:
$ javac main_arguments.java
$ java main_arguments
1 2 3

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Exam Prep: GATE

0 15426

Q:

Which of the following best describes JavaScript?

A) a scripting language precompiled in the browser.	B) an object-oriented scripting language
C) a low-level programming language.	D) a compiled scripting language.

Answer & Explanation Answer: B) an object-oriented scripting language

Explanation:

JavaScript, often abbreviated as JS, is a high-level, interpreted programming language that conforms to the ECMAScript specification.

JavaScript has

* curly-bracket syntax,

* dynamic typing,

* prototype-based object-orientation, and

* first-class functions.

Uses :

It is well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat.

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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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Exam Prep: AIEEE , Bank Exams
Job Role: Analyst , Bank Clerk , Database Administration , IT Trainer

11 13867

Q:

Which of the following attribute can hold the JavaScript version?

A) script	B) version
C) language	D) none of the above

Answer & Explanation Answer: C) language

Explanation:

Language attribute contains the javascript versions.

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8 12887

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:

What are the types of Collision Resolution Techniques and the methods used in each of the type?

Answer

Open addressing (closed hashing),

The methods used include: Overflow block,

Closed addressing (open hashing)

The methods used include: Linked list, Binary tree…

Workspace

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Subject: Java - Technology

16 12592

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 is not a keyword?

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

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