Java Tutorial

  • Last Updated : 20 Sep, 2023

Complete Java Tutorial

This Java programming tutorial is designed for beginners as well experienced professionals. Whether you’re looking to learn the basics of Java or its advanced concepts, our Java tutorial is the perfect resource for you.

What is Java?

Java is a most popular, object-oriented, widely used programming language and platform that is utilized for Android development, web development, artificial intelligence, cloud applications, and much more. So, mastering this gives you great opportunities in bigger organizations.

Simple Hello World Program :

// A Java program to print "Hello World" 
public class GFG { 
    public static void main(String args[]) 
        System.out.println("Hello World"); 


Hello World

Recent Articles on Java

Java Programs – Basics to Advanced

Java Interview Questions


Overview of Java

Basics of Java

Input/Output in Java

Flow Control in Java

Operators in Java

Strings in Java

Arrays in Java

OOPS in Java

Inheritance in Java

Abstraction in Java

Encapsulation in Java

Polymorphism in Java

Constructors in Java

Methods in Java

Interfaces in Java

Wrapper Classes in Java

Keywords in Java

Access Modifiers in Java

Memory Allocation in Java

Classes of Java

Packages in Java

Collection Framework in Java

List in Java

Queue in Java

Map in Java

Set in Java

Exception Handling in Java

Multithreading in Java

Synchronization in Java

File Handling in Java

Java Regex

Java IO

Java Networking

Java SE 8 Features

Java Date & Time


Java Miscellaneous

Interview Questions on Java

Features of Java

Java is one of the most popular and widely used programming languages.

  • Java has been one of the most popular programming languages for many years.
  • Java is Object Oriented. However, it is not considered as pure object-oriented as it provides support for primitive data types (like int, char, etc)
  • The Java codes are first compiled into byte code (machine-independent code). Then the byte code runs on Java Virtual Machine (JVM) regardless of the underlying architecture.
  • Java syntax is similar to C/C++. But Java does not provide low-level programming functionalities like pointers. Also, Java codes are always written in the form of classes and objects.
  • Java is used in all kinds of applications like Mobile Applications (Android is Java-based), desktop applications, web applications, client-server applications, enterprise applications, and many more.
  • When compared with C++, Java codes are generally more maintainable because Java does not allow many things which may lead to bad/inefficient programming if used incorrectly. For example, non-primitives are always references in Java. So we cannot pass large objects (like we can do in C++) to functions, we always pass references in Java. One more example, since there are no pointers, bad memory access is also not possible.
  • When compared with Python, Java kind of fits between C++ and Python. The programs are written in Java typically run faster than corresponding Python programs and slower than C++. Like C++, Java does static type checking, but Python does not.

Applications of Java

  • Mobile Applications
  • Desktop GUI Applications
  • Artificial intelligence
  • Scientific Applications
  • Cloud Applications
  • Embedded Systems
  • Gaming Applications

Frequently Asked Questions on Java

Q.1 Why use Java ?

-Java is simple to learn programming language because doesn’t contain concepts like : Pointers and operator overloading and it is secure and portable.

Q.2 How Java different to C++ ?

C++ is platform dependent. Java is platform independent.
C++ uses compiler only. Java uses compiler and interpreter both.
C++ support pointers and operator overloading. Java doesn’t support pointers and operator overloading concept.
C++ not support multithreading concept. Java supports multithreading concept.