Install Oracle Java 7 in Ubuntu via PPA

nstall Oracle Java 7 in Ubuntu via PPA
This package provides Oracle Java JDK 7 (which includes Java JDK, JRE and the Java browser plugin). However, you can't only install Oracle JRE - the PPA only provides the full Oracle JDK7 package.
To add our PPA and install the latest Oracle Java 7 in Ubuntu (supports Ubuntu 13.10, 13.04, 12.10, 12.04 and 10.04), use the commands below:

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java7-installer

After the installation finishes, if you wish to see if it was successful, you can run the following command:

java -version

It should return something like this:

java version "1.7.0_10"
Java(TM) SE Runtime Environment (build 1.7.0_10-b18)
Java HotSpot(TM) 64-Bit Server VM (build 23.6-b04, mixed mode)

The package installs all the Java binaries, so you can also try "javac -version"which should return "javac 1.7.0_10"and so on (the "_10"part of the version can be different because I'm constantly updating the PPA with the latest Oracle Java 7 version).
The current JDK version in the PPA is Oracle Java 7 Update 10 (7u10).
If for some reason, the Java version in use is not 1.7.0, you can try to run the following command:

sudo update-java-alternatives -s java-7-oracle

Update: the installer now requires you accept the Oracle license before the installation begins. This is only required once. If for some reason you need the installation to be automated, you can run the following command to automatically accept the Oracle license:

sudo echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections

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).
Removing Oracle Java 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-java7-installer