Installation of Open Java in ubuntu

Introduction

Java is a technology from Oracle (formerly: Sun Microsystems). There are several implementations, of which five will be discussed here:

• OpenJDK: The primary goal of the OpenJDK project is to produce an open-source implementation of the Java SE Platform (6 and 7). This is the default version of Java that Ubuntu uses and is the easiest to install.

• Oracle (Sun) Java 6: Oracle (Sun) Java 6 is the reference implementation for Java 6.

• Oracle Java 7: Oracle Java 7 is the reference implementation for Java 7.

• IBM Java: IBM Java is the preferred Java solution on PowerPC machines. It is a reimplementation with a Just-In-Time Compiler. It is only available from IBM's website.

• GNU Compiler: A Java compiler made by GNU. Only developers should have to install this.

OpenJDK

Installation of Java Runtime Environment

• Install the openjdk-6-jre package using any installation method.

• Install the openjdk-7-jre package using any installation method.

Browser plugin

• Install the icedtea6-plugin package using any installation method.

• Install the icedtea-7-plugin package using any installation method.

This plugin works with the main browsers: Firefox, Chromium, Google Chrome, and Epiphany.

On Konqueror, go to Settings → Configure Konqueror... and from menu select Java & JavaScript, then tick Enable Java globally option.

SDK (Software Development Kit)

• Install the openjdk-6-jdk package using any installation method.

• Install the openjdk-7-jdk package using any installation method.

Source: https://help.ubuntu.com/community/Java