How to install Java 8 on ubuntu 15.04/14.10/14.04 using PPA

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The Java language has undergone several changes since JDK 1.0 as well as numerous additions of classes and packages to the standard library. Since J2SE 1.4, the evolution of the Java language has been governed by the Java Community Process (JCP), which uses Java Specification Requests (JSRs) to propose and specify additions and changes to the Java platform. The language is specified by the Java Language Specification (JLS); changes to the JLS are managed under JSR 901.

In addition to the language changes, much more dramatic changes have been made to the Java Class Library over the years, which has grown from a few hundred classes in JDK 1.0 to over three thousand in J2SE 5. Entire new APIs, such as Swing and Java2D, have been introduced, and many of the original JDK 1.0 classes and methods have been deprecated. Some programs allow conversion of Java programs from one version of the Java platform to an older one (for example Java 5.0 backported to 1.4) (see Java backporting tools).

After the Java 7 release, Oracle promised to go back to a 2 year release cycle. However, in 2013, Oracle announced that they would delay Java 8 by one year, in order to improve the Java security model.

Install Java 8 on ubuntu 15.04/14.10/14.04 using PPA

First you need to remove any existing java versions i.e openjdk using the follwoing command

sudo apt-get purge openjdk*

Now you need to run the following commands to install java 8

sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

You can check the java version using the following command

java -version

If you want to switch between java versions run the following command from your terminal

sudo update-alternatives --config java

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