How To Install JAVA on Debian (via Repository)

HOW TO INSTALL ORACLE JAVA 7 IN DEBIAN VIA REPOSITORY

A quick tip for Debian users who want to install and stay up to date with the latest Oracle Java 7 (JDK7): the WebUpd8 Java 7 PPA works on Debian too since the package is just an installer and all you have to do is manually add the PPA repository to the Software Sources.

As a reminder, the Oracle Java 7 PPA repository does not host any Java files but only an installer that automatically downloads and installs Oracle Java 7, like the flashplugin-installer package for instance.

To add the WebUpd8 Oracle Java PPA repository to the Software Sources in Debian (tested on Debian Squeeze, but it should work with any Debian version), use the following commands:

su -

echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list

echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu precise main" | tee -a /etc/apt/sources.list

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys EEA14886

apt-get update

apt-get install oracle-java7-installer

exit

And that's it, Oracle Java 7 (both JDK7 and JRE7) should now be installed and you should receive automatic updates with future Oracle Java 7 versions, under Debian.
Update: the current JDK version in the PPA is Oracle Java 7 Update 10 (7u10).

Setting Java environment variables

To automatically set up the Java 7 environment variables, you can install the following package:

sudo apt-get install oracle-java7-set-default

If you've already installed oracle-java6-set-default or oracle-java8-set-default, they will be automatically removed when installing oracle-java7-set-default (and the environment variables will be set for Oracle Java 7 instead).
For installing Oracle Java 7 in Ubuntu, see: Install Oracle Java 7 in Ubuntu via PPA Repository

Taken From: http://www.webupd8.org/2012/06/how-to-install-oracle-java-7-in-debian.html