sudo wget http://monalisa.cern.ch/MONALISA/download/java/jdk-7u80-linux-x64.tar.gz
sudo mkdir -p /usr/local/java
sudo cp -r jdk-7u80-linux-x64.tar.gz /usr/local/java
cd /usr/local/java/
sudo tar xvzf jdk-7u80-linux-x64.tar.gz
sudo nano /etc/profile
and paste the following at the end of the file:
==================
JAVA_HOME=/usr/local/java/jdk1.7.0_80
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
export PATH
==================
Save and exit.
sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.7.0_80/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.7.0_80/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws.itweb" "javaws.itweb" "/usr/local/java/jdk1.7.0_80/bin/javaws" 1
sudo update-alternatives --set java /usr/local/java/jdk1.7.0_80/bin/java
sudo update-alternatives --set javac /usr/local/java/jdk1.7.0_80/bin/javac
sudo update-alternatives --set javaws.itweb /usr/local/java/jdk1.7.0_80/bin/javaws
source /etc/profile
reboot
java -version
/usr/local/java/jdk1.7.0_80/bin/jcontrol
sudo mkdir -p /usr/lib/mozilla/plugins
sudo ln -s /usr/local/java/jdk1.7.0_80/jre/lib/amd64/libnpjp2.so /usr/lib/mozilla/plugins/libnpjp2.so