Simple instructions for getting Java to work on 5.10?

[Xn Nooby]

I'm new to Ubuntu, so I really need instructions to be fool-proof.  The
instructions I have found on the web do not work on a default install.
Ideally the JRE or JDK would work with Firefox.  I need to be able to access
a web-based java/jre financial application.

Are there any instructions on how to do this, which assumes you have a
default installation?

I could not get either of these instructions to work:
  http://www.cs.cornell.edu/~djm/ubuntu/#java
  https://wiki.ubuntu.com/RestrictedFormats

Both say "java-package" is unknown.

thanks
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