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JDK 1.8 or 1.7 set default on Linux

cavadjava@Programci:~$ sudo apt-get install oracle-java8-set-default

 cavadjava@Programci:~$ sudo apt-get install oracle-java7-set-default
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java6-installer


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