How to use ubuntu 12.04 simply install java 8

First you may to download the java 8 website
here

Seccond Downloading the java tar gz file and text following command
 sudo -s
cd Downloads
tar -zvxf  jdk-8-linux-i586.tar.gz
cd jdk1.8.0
mkdir /usr/java
cp -r * /usr/java
echo PATH="$PATH":/usr/java/bin>>~/.bashrc
ln -s /usr/java/jre/lib/i386/libnpjp2.so /usr/lib/mozilla/plugins
cp -p /usr/java/jre/plugin/desktop/sun_java.desktop /usr/share/applications/
cp -p /usr/java/jre/plugin/desktop/sun_java.png /usr/share/applications/

echo [Desktop Entry]>>/usr/share/applications/Java.desktop
echo Type=Application>>/usr/share/applications/Java.desktop
echo Version=1.0>>/usr/share/applications/Java.desktop                      
echo Name=Java>>/usr/share/applications/Java.desktop                         
echo Comment=The java loader>>/usr/share/applications/Java.desktop   
echo Exec=java -jar>>/usr/share/applications/Java.desktop
echo Icon=sun_java.png>>/usr/share/applications/Java.desktop
echo Terminal=false>>/usr/share/applications/Java.desktop
 bash

Step 3 done!

Step 4 uninstall method

sudo rm -rf /usr/java