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Overview of Java

Java is one of the world's most important and widely used computer languages.It is intended to let application developer "write once, run everywhere" meaning that code that runs on one platform does not need to be recompiled to run on another platform.

Java is mostly used programming language for developing console/web-based applications.


Creation of Java

Java was developed by James Ghosling, Patrick Naughton, Mike Sheridan at Sun Microsystems Inc. in 1991.

The initial name was Oak but was renamed to Java in 1995.


Java Programming Language

As a programming lanugage, Java can create all kinds of applications.
  1. Developing Desktop Application
  2. Web Applications like Linkedin
  3. Mobile OS like Android
  4. Embedded System
  5. Robotics and games etc.

Java Development Environment

Java Development Environment provides a sets of tools.
  1. javac - Java Compiler
  2. java - Java Interpreter
  3. javadoc- A document generator
  4. *.jar - A set of libraries.

Java Runtime Environment (JRE)

Java application runs over Java Runtime Environment(JRE),which is also known as Java Virtual Machine (JVM).
  1. JVM built inside a browser.
  2. JVM on different operation system ( Window, Linux, Mac etc)
  3. JVM on diverse platform provides the common runtime environment for Java programs. "Write Once Run EveryWhere

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