Learn Java
- About Java
- What is Java?
- What was the reason of creation?
- What is JVM, JRE, JDK?
- Features of Java
- Evolution of Java
1 . About Java
- One of the most popular programming languages since 1996
- Making searching/locating and usage of classes, interfaces, enumerations and annotations easier
- Has around 10 million developers worldwide.
- Considered for small devices to enterprise applications.
2 . What Is Java?
Developed as a high level programming language by Sun Microsystems in 1996.
- Now a platform and development & runtime environment.
3 . What Was The Reason Of Creation?
- Needed a cross-platform language for multi-device development.
- C++ though object oriented and widely used was highly resource intensive.
- Developed with aim of ‘Write Once, Run Anywhere’.
How Is It Platform Independent?
- Traditional Model – Source Code → Native Code
- Java Programming Model – Source Code → Byte Code → JVM (Windows JVM, Linux JVM etc.)
4 . What Is JVM, JRE, JDK?
- JVM : Java Virtual Machine running on host for running Java executables.
- JRE:- Java Runtime Environment provides core libraries along with JVM for running byte code.
- JDK:- Java Development Kit is software for developing java apps and provides a JRE and a compiler.
5 . Features Of Java
- Platform Independent
- Compiled and Interpreted
- Object Oriented
- Simple
- Robust & Secure
- Multithreaded
- Dynamic
6 . Evolution Of Java
- JDK 1.0 (January 23, 1996)
- JDK 1.1 (February 19, 1997)
- J2SE 1.2 (December 8, 1998)
- J2SE 1.3 (May 8, 2000)
- J2SE 1.4 (Feb 6, 2002)
- J2SE 5.0 (Sept 30, 2004)
- Java SE 6 (Dec 11, 2006)
- Java SE 7 (July 7, 2011)
- Java SE 8 (March 18, 2014)
