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###Install Java JDK 7 on Ubuntu

This package provides Oracle Java JDK 7 (which includes JRE, the Java browser plugin and JavaFX). However, you can’t only install Oracle JRE – the PPA only provides the full Oracle JDK7 package.

1. To add our PPA and install the latest Oracle Java (JDK) 7 in Ubuntu, use the commands below:

sudo add-apt-repository ppa:webupd8team/java sudo apt-get update && sudo apt-get install oracle-jdk7-installer

1. After the installation you have enable the jdk:

update-alternatives –display java

1. Check if Ubuntu uses Java JDK 7

java -version

If all went right the answer should be something like this:

java version "1.7.0_07"

Java(TM) SE Runtime Environment (build 1.7.0_07-b10) Java HotSpot(TM) Server VM (build 23.3-b01, mixed mode)'

1. Check what compiler is used:

javac -version

The correct answer should be like this:

javac 1.7.0_07

1. Adding JAVA_HOME to environment Edit /etc/environment and add JAVA_HOME=/usr/lib/jvm/java-7-oracle to the end of the file. First open a Terminal (Applications → Accessories → Terminal), then enter:

sudo pico /etc/environment

Append to the end of the file:

JAVA_HOME=/usr/lib/jvm/java-7-oracle

1. Removing Oracle JDK 7 If you don’t want to use Oracle Java (JDK) 7 anymore and want to go back to OpenJDK, all you have to do is remove the Oracle JDK7 Installer and the previous Java (OpenJDK, etc.) version will be used:

sudo apt-get remove oracle-jdk7-installer