Java - What is Java, History, Features of Java - Full (A-Z) Complete Course

 What is Java? Definition, Meaning & Features of Java, Components



  • The history of Java is very interesting. Java was originally designed for interactive television, but it was too advanced technology for the digital cable television industry at the time.
  •  The history of Java starts with the Green Team. Java team members (also known as Green Team), initiated this project to develop a language for digital devices such as set-top boxes, televisions, etc.
  •  However, it was suited for internet programming. Later, Java technology was incorporated by Netscape.
  • After that, it was called Oak and was developed as a part of the Green project.


  • Why Oak? Oak is a symbol of strength and chosen as a national tree of many countries like the U.S.A., France, Germany, Romania, etc.
  • In 1995, Oak was renamed as "Java" because it was already a trademark by Oak Technologies.

Java is a high-level programming language originally developed by James Gosling developed the Java platform at Sun Microsystems, and the Oracle Corporation later acquired it. and released in 1995. Java runs on a variety of platforms, such as Windows, Mac OS, and the various versions of UNIX. This tutorial gives a complete understanding of Java.

  •  JDK 1.0 released in(January 23, 1996). After the first release of Java, there have been many additional features added to the language.
  •  Now Java is being used in Windows applications, Web applications, enterprise applications, mobile applications, cards, etc. Each new version adds the new features in Java.


Java is a multi-platform, object-oriented, and network-centric language. It is among the most used programming language. Java is also used as a computing platform.

It is considered one of the fast, secure, and reliable programming languages preferred by most organizations to build their projects.


Here are some important Java applications:


  • It is used for developing Android Apps
  • Helps you to create Enterprise Software
  • Wide range of Mobile java Applications
  • Scientific Computing Applications
  • Use for Big Data Analytics
  • Java Programming of Hardware devices
  • Used for Server-Side Technologies like Apache, JBoss, GlassFish, etc.


Here are some important Java features:


  • It is one of the easy-to-use programming languages to learn.
  • Write code once and run it on almost any computing platform.
  • Java is platform-independent. Some programs developed in one machine can be executed in another machine.
  • It is designed for building object-oriented applications.
  • It is a multithreaded language with automatic memory management.
  • It is created for the distributed environment of the Internet.
  • Facilitates distributed computing as its network-centric.

Features OF JAVA Detail: CLICK HERE


A Java Programmer writes a program in a human-readable language called Source Code. Therefore, the CPU or Chips never understand the source code written in any programming language.

These computers or chips understand only one thing, which is called machine language or code. These machine codes run at the CPU level

However, you need to worry about the machine code, as programming is all about the source code. The machine understands this source code and translates them into machine-understandable code, which is an executable code.

All these functionalities happen inside the following 3 Java platform components:


JDK is a software development environment used for making applets and Java applications. 

The full form of JDK is Java Development Kit. Java developers can use it on Windows, macOS, Solaris, and Linux. 

JDK helps them to code and run Java programs. It is possible to install more than one JDK version on the same computer.



Here are the main reasons for using JDK:


  • JDK contains tools required to write Java programs and JRE to execute them.
  • It includes a compiler, Java application launcher, Appletviewer, etc.
  • Compiler converts code is written in Java into byte code.
  • Java application launcher opens a JRE, loads the necessary class, and executes its main method.


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. JVM is a part of the Java Run Environment (JRE). 

In other programming languages, the compiler produces machine code for a particular system. 

However, the Java compiler produces code for a Virtual Machine known as Java Virtual Machine.



Here are the important reasons for using JVM:


  • JVM provides a platform-independent way of executing Java source code.
  • It has numerous libraries, tools, and frameworks.
  • Once you run a Java program, you can run it on any platform and save lots of time.
  • JVM comes with JIT (Just-in-Time) the compiler that converts Java source code into low-level machine language. Hence, it runs faster than a regular application.


JRE is a piece of software that is designed to run other software. It contains the class libraries, loader class, and JVM. In simple terms, if you want to run a Java program, you need JRE. If you are not a programmer, you don't need to install JDK, but just JRE to run Java programs.


Here are the main reasons for using JRE:


  • JRE contains class libraries, JVM, and other supporting files. It does not include any tool for Java development like a debugger, compiler, etc.
  • It uses important package classes like math, swing, util, lang, awt, and runtime libraries.
  • If you have to run Java applets, then JRE must be installed in your system.

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