ubuntu install oracle jdk

.Download the required tarball from here
.unzip this tarball using "tar -zxvf tarball_name
.create a folder name java in /usr/lib, you need root permission
.mv the extracted folder to /usr/lib/java/
.next run these below scripts in terminal
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/java/jdk1.7.0_65/bin/java"
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/java/jdk1.7.0_65/bin/javac"
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/java/jdk1.7.0_65/bin/javaws"
.update the JAVA_HOME in your ~/.bashrc
export JAVA_HOME=/usr/lib/java/jdk1..0_65
set PATH="$PATH:$JAVA_HOME/bin"
export PATH
Your bashrc should look like bashrc