1.Download the required tarball from here
2.unzip this tarball using "tar -zxvf tarball_name
3.create a folder name java in /usr/lib, you need root permission
4.mv the extracted folder to /usr/lib/java/
5.next run these below scripts in terminal
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/java/jdk1.7.0_65/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/java/jdk1.7.0_65/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/java/jdk1.7.0_65/bin/javaws" 1
6.update the JAVA_HOME in your ~/.bashrc
export JAVA_HOME=/usr/lib/java/jdk1.7.0_65
set PATH="$PATH:$JAVA_HOME/bin"
export PATH
Your bashrc should look like bashrc
