Java Development Kit (JDK)

Java is a is a general-purpose programming language that is taught in first year Computer Science at UoB. The development kit is the package you need in order to compile and run Java applications.

Notice: Java and JavaScript are two very different languages - it has as much in common as a Car and a Carpet.

Installation

Manjaro:

 sudo pacman -S jre-openjdk

Ubuntu:

sudo apt install default-jdk

Running

In order to verify that Java has been installed correctly, run the following command.

java --version

This should produce the following (or similar) output if working correctly. ../images/java-version.png

Multiple Java Versions

The first year CS course at UoB requres submissions compatible with Java 11, and so recommend that this is what's used for assignments. In general though it is a good idea to have the latest version available. In this case it's useful to be able to manage multiple installed java versions on one PC. It may well be that the latest version of Java that comes with your distriubtion is java 11 (as with Ubuntu 20.04), in which case you can ignore this section.

Assuming you've already installed the latest JDK as above, install JDK 11:

Manjaro:

sudo pacman -S jdk11-openjdk

Ubuntu:

sudo apt install openjdk-11-jdk

Once the new version is installed, you will be able to see all installed versions like this:

Manjaro:

archlinux-java status

Ubuntu:

update-alternatives --list java

And switch between them like this:

Manjaro:

sudo archlinux-java set <java version>

Ubuntu:

sudo update-alternatives --config java

Removal

Manjaro:

 sudo pacman -Rs jre-openjdk

Ubuntu:

sudo apt remove default-jdk

Installing Eclipse

You may want to install Eclipse, the IDE recommended by the School. The easiest way to do this, is to install it through snap. Both Ubuntu and Manjaro come with snap installed.

To install Eclipse:

sudo snap install eclipse --classic

After Eclipse is installed, you might want to check for updates. From Eclipse, go to Help -> Check for updates. Select the updates you want to do, click Next, confirm, agree with the Terms and Conditions and click Finish.

You may want to install other software/plugins. Can do this from Help -> Install New Software. Select the URL corresponding to the Eclipse version you have and the list will get populated with possible software you may want to install.

Eclipse Software