Installing Java on Ubuntu Manually

Steps to follow:

1. Download jdk. I downloaded java7 from oracle's website.
2. Unzip and copy the folder into /usr/lib/jvm
     Make directory jvm if it doesn't exist. I renamed the folder to java-7-oracle
3. Open /etc/environment and add this line
     JAVA_HOME=/usr/lib/jvm/java-7-oracle
     PATH=$PATH:$JAVA_HOME/bin
4. Then execute this command
     source /etc/environment
5. On terminal type java -version to check if it shows the right version

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