333+ Java Interview MCQ Questions and Answers with Explanations

Q:

main() {

int i;

printf("%d",scanf("%d",&i)); // value 10 is given as input here

}

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

Answer & Explanation Answer: A) 1

Explanation:

Scanf returns number of items successfully read and not 1/0. Here 10 is given as input which should have been scanned successfully. So number of items read is 1.

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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:

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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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:

What will be the output of the following code snippet?

Object s1 = new String("Hello");
Object s2 = new String("Hello");

if(s1 == s2) {
System.out.println("s1 and s2 are ==");
}else if (s1.equals(s2)) {
System.out.println("s1 and s2 are equals()");
}

Answer

Answer : s1 and s2 are equals()

Explanation:

Workspace

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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:

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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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

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