I am new to Ubuntu:How Do I get the openjdk API Documentation and all the Other packages installed just as it is mentioned in the installation section relevant to Fedora?

[Varuna Seneviratna]

I am new to Ubuntu:How Do I get the openjdk API Documentation and all
the Other packages installed just as it is mentioned in the
installation section relevant to
Fedora?(http://openjdk.java.net/install/#fedora)