Written by Siddartha Thota on September 7, 2017 in Java

5 Commonly Asked Java Interview Questions and Answers


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If you are a software engineer, then you must be familiar with the concept of programming. It is one of the essential requirements if you are seeking employment in a software company. In order to ace an interview that involves programming, there are two things that you should have. First is great logical reasoning and the second is great command over a programming language.

There are several programming languages that you can master, but one of the most widely used programming languages is Java. It is the first fully object-oriented language, which is platform independent and therefore it has various advantages as compared to other languages.

java interview questions

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Here are some of the Basic Java interview questions that are commonly asked:

  1. What Is the Difference between JDK, JRE and JVM?

JDK, JRE and JVM are important parts of Java. JVM (Java Virtual Machine) is an abstract machine, which provides a runtime environment for the byte code to get executed. Java byte code is the intermediate form, which is understood by the machine. JRE stands for Java Runtime Environment and it is the implementation of java virtual machine. JDK is known as Java Development Kit. It is a physical entity that contains JRE along with other tools for development.

  1. What Do You Understand by a JIT Compiler?

JIT compiler (Just In Time compiler) enhances the performance of the compiler as it compiles only those parts of the byte code that have the same function. Therefore, the overall time for the compilation decreases. The compiler is used to convert the user instructions to a format that is understood by the computer and this format is known as byte code.

  1. What Makes Java Platform Independent?

The byte code is responsible for making Java platform independent. With the help of a compiler, the source code is converted into machine code and the intermediate language is called byte code. This byte code is not specific to any platform and hence can be run on any machine.

  1. What Is a Static Method?

A method or a function becomes static when it has the keyword, static written before it. A static method is a part of the class and not the object of a class. It can be called without the creation of an instance or an object. All the data members that are declared static can be accessed with the help of this method and it can also change their value.

  1. What Are the 4 Pillars of OOPs?

The first pillar of OOPs (Object Oriented Programming) is encapsulation, which means wrapping up of data into a single unit. The second is the abstraction, which means hiding the irrelevant details of a program. The third is the inheritance, which means that the properties of one class can be used by another class. And the last is the polymorphism, which means that a single function can behave in different ways.

Here are some of the best resources that we suggest you.

The above-mentioned questions are usually asked in all interviews, so make sure you prepare them properly. We will keep adding more information about the Java Interview Questions in this post. Stay tuned for updates.

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