Updating OpenJDK (Ubuntu)

[booman]

If you are running an older version of Ubuntu such as Ubuntu 12.04
Some Java games refuse to work on the old versions of Java
You can install OpenJDK 8 from a PPA repository

Follow these steps to update OpenJDK:

Open Terminal
Ctrl+Alt+T

Add PPA
Type:

sudo add-apt-repository ppa:openjdk-r/ppa

Press Enter
Enter password

Update
Type:

sudo apt-get update

Press Enter

Install OpenJDK 8
Type:

sudo apt-get install openjdk-8-jdk

Press Enter

Set Default Java
Type:

sudo update-alternatives --config java[code]
Press Enter
Note:  Type in a number to select a Java version

Set default compiler
Type:
[code]sudo update-alternatives --config javac

Press Enter

Verify installation
Type:

java -version

Press Enter

Output should look like this:

openjdk version "1.8.0_01-internal"
OpenJDK Runtime Environment (build 1.8.0_01-internal-b04)
OpenJDK 64-Bit Server VM (build 25.40-b08, mixed mode)