Cài JDK 8 Trên Ubuntu 14.04 
Installing Java 8 on Ubuntu
Add the webupd8team Java PPA repository in your system and install Oracle Java 8 using following set of commands.
$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer
 
 
Verify Installed Java Version 
After successfully installing oracle Java using above step verify installed version using following command.
rahul@tecadmin:~$ java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)
 
Configuring Java Environment 
In Webupd8 ppa repository also providing a package to set environment variables, Install this package using following command.
$ sudo apt-get install oracle-java8-set-default
 
 
 
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