JAVA Interview Questions

Core Java Basic Interview Questions answers

200+ Core Java Interview Questions and Answers (2024)

 

Basic Questions

  1. What is Java?

    • Java is a high-level, class-based, object-oriented programming language designed to have as few implementation dependencies as possible.

  2. What are the main features of Java?

    • Platform Independent
    • Object-Oriented
    • Simple and Secure
    • Robust and Multithreaded
    • High Performance

  3. What is JVM (Java Virtual Machine)?

    • JVM is an engine that provides a runtime environment to drive the Java Code or applications. It converts Java bytecode into machine language.

Intermediate Questions

  1. Explain the concept of OOP (Object-Oriented Programming).

    • OOP is a programming paradigm based on the concept of “objects”, which can contain data and code to manipulate the data. Key principles include encapsulation, inheritance, polymorphism, and abstraction.

  2. What is the difference between JDK, JRE, and JVM?

    • JDK (Java Development Kit) is a software development kit used to develop Java applications.
    • JRE (Java Runtime Environment) is a set of software tools for development of Java applications.
    • JVM (Java Virtual Machine) is a part of JRE which runs Java bytecode.

  3. What are Java Collections?

    • Java Collections framework provides a set of interfaces and classes to store and manipulate groups of objects as a single unit.

Advanced Questions

  1. What is multithreading and how is it implemented in Java?

    • Multithreading is a process of executing multiple threads simultaneously. Java provides built-in support for multithreaded programming through the Thread class and the Runnable interface.

  2. Explain the concept of garbage collection in Java.

    • Garbage collection is the process by which Java programs perform automatic memory management. The garbage collector finds and deletes objects that are no longer being used by a program.

  3. What are design patterns and name a few commonly used ones in Java.

    • Design patterns are typical solutions to common problems in software design. Some common design patterns in Java include Singleton, Factory, Observer, and Strategy.

 

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