[Ubuntu >= 12.04] Install Oracle Java 8


        
            
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            Download URL
https://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html
How to install
tar -zxvf jdk-8u191-linux-i586.tar.gz 
sudo cp -Rap jdk1.8.0_191 /opt
sudo update-alternatives --install /usr/bin/java java /opt/jdk1.8.0_191/bin/java 100
sudo update-alternatives --install /usr/bin/javac javac /opt/jdk1.8.0_191/bin/javac 100
update-alternatives --display java
update-alternatives --display javac
java -version
javac