How to install Java on Ubuntu and Update it.
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
After successfully installing oracle Java using above step verify installed version using following command.
$ java -version
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
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
If you need the latest Oracle Java 6, you install it too:
sudo apt-get install oracle-java6-installer
If you need the latest Oracle Java 6, you install it too:
sudo update-java-alternatives -s java-7-oracle
If you want test Oracle Java 9 early access builds, you can install it too:
sudo apt-get install oracle-java9-installer
