To find out what version your system has, or if it has Java at all,
open a Command Line Interface, and enter the command shown below.
(In Windows, the CLI is called 'Command Prompt' and is located
in the Start menu under Accessories. In Linux/Gnome, it's
called 'Terminal' and located under 'System Tools'.)
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java ‑version
If you get a 'command not found' message, or your version is less than 1.4, you will need to install the latest JRE. For Windows users, it's quite easy. Go to http://java.com/ and click on 'Free Java Download'.
Linux users can also get the JRE from java.com, but installation requires a bit more work. There is a short explanation of how to install Java in a Linux system here.