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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

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

August 18, 2024January 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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Core Java Interview Questions

What is null pointer exception in java ? How to prevent?

August 18, 2024December 30, 2017 rsingh

Answer includes, null pointer exception in java with example when it can occur in programs and how we can prevent it. Java interview Question: What

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Core Java Interview Questions

How do you connect database in java programs?

August 18, 2024December 3, 2017 rsingh

JDBC driver is used to connect database in java programs. We need to install compatible jdbc drivers for different types of databases i.e. MySQL, Oracle

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Core Java Interview Questions

What is abstraction in java oops? – Easy way

August 18, 2024January 29, 2023 rsingh

Abstraction in Java is just a concept, and abstraction meaning is “Provide necessary information’s only to clients/users and hide unnecessary details. As an abstraction example,

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Core Java Interview Questions

What is Encapsulation in Java – Best Answer

August 18, 2024October 8, 2017 rsingh

Answer includes concept of encapsulation in java oops with various java encapsulation examples with programs. Answer: Encapsulation in Java is one of the oops principles

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Core Java Interview Questions

Do we have static constructor in java?

August 18, 2024August 6, 2014 rsingh

Answer: No, we don’t have static constructor in java. Actually, java static constructor concept is not there. When we make a class constructor static, compiler

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Core Java Interview Questions

What to prefer if Java Interface and Abstract class have abstract methods only?

August 18, 2024January 29, 2023 rsingh

Technical interview question is that if an Interface and an abstract class in java both contains only abstract methods then what would you choose or

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Core Java Interview Questions

Why to use final method in java programs? – Is it inherited?

August 18, 2024January 29, 2023 rsingh

Answer: final method in java programs is used to stop being overridden in derived class. However, final method can be inherited in derived class. Note that

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Core Java Interview Questions

Can a java abstract class method be final and abstract both?

August 18, 2024September 12, 2017 rsingh

Answer: No, an abstract class method cannot be final and abstract both in java e.g. Reason is that, by making a method final in abstract

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Core Java Interview Questions

Why do we use final class in java? – Is it necessary?

August 18, 2024January 29, 2023 rsingh

Final class in java programs is used to stop inheritance / extension. If we don’t want a class to be inherited or not to be

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