Install java in Linux

Download jdk_version.tar.gz from oracle and extract it to the /user/local/java and create the symlink

user@group:/user/local/java$ tar zxvf /path/to/jdk_version.tar.gz
user@group:/user/local/java$ ln -s jdk_version jdk

user@group:/user/local/java$ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk/bin/java" 1
user@group:/user/local/java$ sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk/bin/javac" 1
user@group:/user/local/java$ sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk/bin/javaws" 1
user@group:/user/local/java$ sudo update-alternatives --set java /usr/local/java/jdk/bin/java
user@group:/user/local/java$ sudo update-alternatives --set javac /usr/local/java/jdk/bin/javac
user@group:/user/local/java$ sudo update-alternatives --set javaws /usr/local/java/jdk/bin/javaws

Reference# http://www.wikihow.com/Install-Oracle-Java-on-Ubuntu-Linux