Install JDK 1.7 on Linux (Ubuntu 14.04)

jdk_linux_install

cd /opt
sudo tar -xzvf ~/Downloads/jdk-7u60-linux-x64.tar.gz 

sudo mkdir -p /usr/lib/jvm
sudo mv ./jdk1.7.0_60/ /usr/lib/jvm/

sudo update-alternatives --install "/usr/bin/java" "java" "/usr/lib/jvm/jdk1.7.0_60/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/lib/jvm/jdk1.7.0_60/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/lib/jvm/jdk1.7.0_60/bin/javaws" 1

sudo chmod a+x /usr/bin/java 
sudo chmod a+x /usr/bin/javac
sudo chmod a+x /usr/bin/javaws

sudo chown -R root:root /usr/lib/jvm/jdk1.7.0_60/

sudo update-alternatives --config java
sudo update-alternatives --config javac
sudo update-alternatives --config javaws