http://java.sun.com/j2se/1.4.2/download.html
is the place where you have to download the rpm from ....
Find the word "Download J2SE SDK"
and click on it....u will see terms and condition page and then...u have to download rpm.bin file (around 46 MB) ....(or 15 MB)
and
http://java.sun.com/j2se/1.4.2/install-linux.html
is the place from where you get the notes and help for installation...
if u feel that difficult, I wud b there to help...
just email me....d_rosh2001@yahoo.co.in