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Category: Core Java Interview Questions

List of Interview Questions on Java for freshers and experienced candidates asked in technical job interviews in IT Industries. This list includes interview questions asked to freshers, 2,3 and 5 years etc. experience professionals | Only Real.

This section contains technical java interview questions and answers for freshers and experienced on java Polymorphims, Java OOPs concept Inheritance, Interface, abstract class, abstraction and encapsulation, classes and objects etc. with impressive answers and explanation. In fact, interview question on many topics I have provided that you should read or brush up that help crack java technical java interviews quickly.

Core Java Interview Questions

Why method overriding is called runtime polymorphism in Java?

September 24, 2018January 29, 2023 rsingh

Answer to why method overriding is called runtime polymorphism in java is because the methods get resolved at the Run-Time. In simple words, when you

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Core Java Interview Questions

Examples where use of Java Static method is Indispensable

July 2, 2018January 29, 2023 rsingh

Let’s see some examples where use of java static methods are mandatory in the programs. Generally, we use static method where we want to call

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Core Java Interview Questions

Why we need double check in singleton class in java? – Answered

May 17, 2018January 29, 2023 rsingh

Answer to why we need double check locking in singleton class in Java with thread program example. Let’s understand first what does the double checking

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Core Java Interview Questions

How to create immutable class in java – Simplest Example

April 16, 2018January 29, 2023 rsingh

We create immutable class in java by making the class fields final and private, and by providing getter setter method, and returning new object with

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Core Java Interview Questions

What to choose between abstract class and interface if…

April 13, 2018 rsingh

Answer to what to choose between abstract class and interface if both contain only abstract methods. This is the frequently asked technical interview question. Here

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Core Java Interview Questions

What is method signature in Java – Does it include return type?

April 2, 2018 rsingh

What is method signature in java ? – Method signature in java includes only method name and parameters. Method return types are not included in

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Core Java Interview Questions

What is the use of volatile keyword in java?

March 27, 2018 rsingh

Use of volatile keyword in Java – The volatile keyword is used to declare a variable volatile, so, the variable can be accessed directly from

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Core Java Interview Questions

Can we overload main method in java?

January 20, 2018 rsingh

Interview Question – Can we overload main method in java programs, for example in below class Sample, public static void main(String[] args) is given, that

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Core Java Interview Questions

Why to use Abstract keyword in java language?

January 20, 2018 rsingh

Abstract keyword is used to create an abstract class and abstract methods in java programs. Abstract class: Abstract class in java is used as a

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Core Java Interview Questions

What are methods of object class in java? – with description

January 19, 2018 rsingh

Methods of Object class in java with brief descriptions – The java.lang.Object class is the super class of all classes  whether the class is predefined or user

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