Top 50 core java interview questions and answers

Hello Fellas, Hope you are fine!

So you are preparing for the cracking the java interview right?

JAVA has widely used object-oriented programing language and there is a lot of demand in the market for a java programmer. The interview session of JAVa has comprised the proficiency in both theory and practicals. In this post, I covered the top 50 core java interview question and answer. These questions are important for freshers as well as experienced. I have left no stone unturned to make this post informative and I am sure you will love that.

Most Frequently asked Java Interview Questions and answers:

The question and answers in this core java interview question and answer are short, crisp and to the point. The questions are categorized in basics, OOP’s, string, multithreading, polymorphism, collection, JDBC and other topics.

1)  What are the features in JAVA which makes it different from others?

Ans: JAVA is uniques and many websites are using java, facebook, amazon is one of them below are some Features of Java which makes it different from other programming languages:

  • Object-oriented
  • Inheritance
  • Encapsulation
  • Polymorphism
  • Abstraction
  • Platform independent
  • High Performance
  • Multi-threaded

2) What is Classloader?

Ans. A subsystem of Java virtual machine, which is used to load the class files. Classloader is the first thing loaded when we run the java program. Bootstrap classloader, extension class loader, and system/application classloader are 3 types of classloader in Java language.


3) What is the reason behind the high performance of the Java language?

Ans. The just in time compiler of Java language makes it high-performance language, The just in time (JIT) compiler converts the instructions into byte codes and make the process robust and smooth.

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4) What is the Local and Instance variable in Java?

Ans. It is the most common question of java, whether it is in viva or interview. The local variable is defined to method and scope, existed in inside the method whereas the instance variable is defined inside the class and outside the method and scope of variable exist in the class.