How to Install Java 7 in Ubuntu 12.04 (Precise)

Install Java 7 in Ubuntu 12.04 (Precise Pangolin)
To install java in Ubuntu 12.04 open terminal and write following commands

1. Add a WEBUPD8 repository

$ sudo add-apt-repository ppa:webupd8team/java
2. Update the repository

$ sudo apt-get update
3. Install Oracle java

$ sudo apt-get install oracle-java7-installer
That's it you have successfully installed java .

To uninstall java type