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 Java Questions

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Q:

How many constructors can a class have?

A) 1 B) 2
C) 4 D) None of the above
 
Answer & Explanation Answer: D) None of the above

Explanation:

A class can have any number of constructors. If a class have more than one constructor, we call it as the constructor is overloaded.

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Q:

Exception handling is targeted at

A) Compile time error B) Logical error
C) Run time error D) All of the above
 
Answer & Explanation Answer: C) Run time error

Explanation:
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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 :



 

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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:

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 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…

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Subject: Java

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Q:

How are this() and super() used with constructors?

Answer

Constructors use this to refer to another constructor in the same class with a different parameter list.


Constructors use super to invoke the superclass's constructor. If a constructor uses super, it must use it in the first line; otherwise, the compiler will complain.

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Q:

Which of the following statements about inheritance is false?

A) Inheritance allows you to minimize the amount of duplicate code in an application by sharing common code among several subclasses. B) A subclass inherits all the members (fields, methods, and nested classes) from its superclass.
C) Through inheritance, a parent class is a more specialized form of the child class. D) Inheritance allows you to reuse the fields and methods of the super class without having to write them yourself.
 
Answer & Explanation Answer: C) Through inheritance, a parent class is a more specialized form of the child class.

Explanation:
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