Install Oracle Java JDK on Ubuntu 14.04

1. Download the JDK from Oracle.
2. Extract the file to /user/lib/jvm.
3. Change the owner to root:
   chown -R root:root jdk1.8.0_11*
4. Install java, javac, etc..:
   update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.8.0_11/bin/java 1065
5. Setting the system's java version:
   update-alternatives --cofig java
6. Testing the java installation:
   java -version