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Introduction to Java

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Contents

History

Characteristics of Java

JDK Versions & Editions

The way Java works

Phases of java program

A simple java Application

Summary

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Java: History

Developed by James Gosling at Sun Microsystems.

Released the first public implementation as Java 1.0

in 1995.

The language was initially called Oak. It is intended to let application developers "write

once, run anywhere.

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James A. Gosling

A Software developer, best

known as the father of the

java programming language

Born : May 19, 1955

Residence : San Francisco

Nationality : Canada

Employer : Google

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Java is

Simple

Object oriented

Multi Threaded

Platform independent

Both Compiled and Interpreted

Secure

Distributed

Characteristics

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JDK Versions

JDK 1.0 (January 23, 1996) Oak

JDK 1.1 (February 19, 1997)

In this version the major inclusions are AWT, JDBC, RMI.

J2SE 1.2 (December 8, 1998) Playground

The Major inclusion is Swing.

J2SE 1.3 (May 8, 2000) Kestrel

The Key Modification is JNDI.

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JDK Versions

J2SE 1.4 (February 6, 2002) Merlin

J2SE 5.0 (September 30, 2004) Tiger

J2SE 6 (December 11, 2006) Mustang

There are 26 updates in J2SE6

J2SE 7 (July 28, 2011) Dolphin

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JDK Editions

Java Standard Edition (J2SE):

J2SE can be used to develop client-side standalone

applications or applets.

Java Enterprise Edition (J2EE):

J2EE can be used to develop server-side applications such

as Java Servlets and Java Server Pages. Java Micro Edition (J2ME):

J2ME can be used to develop applications for mobile

devices such as cell phones.

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The way java works

The goal is to write one application and have It work on

different devices

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Phases of java program

The following figure describes the process of

compiling and executing a Java program

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Simple Java Application

//This application program prints Welcome

//to Java!package chapter1;

public class Welcome {

public static void main(String[] args) {System.out.println("Welcome to Java!");

}}

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A class with main method

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Summary

History

Initially called as Oak by James Gosling.

Characteristics

Simple, Multi threaded, Portable , Secure, Distributed.

JVM An imaginary machine that is implemented by emulating

software on a real machine

provides the hardware platform specifications to which

you compile all Java technology code Phases of java program

Write a program, compile and run.

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