You can get crossover plugin, that will allow you to run all of the Windoze browser plugins on Linux. It's like $25, if you actually need, or just really want that kind of thing. I bought it a while back, I can't say that I really use it that much, but it is nice to be able to view shockwaves once in a while.
You can get Java set pretty easily but how kind of depends on which distro you are running.
So anyway y2kzigen, we kind of hijacked your post and got lost somewhere. But, you can get Java set up pretty easily but how kind of depends on which distro you are running. I would say the easiest thing is to just use apt-get if you are running a distro which can use the apt program. Debian, and most of the RPM based distros can use apt. If you are using an RPM based (RedHat, Mandrake, too many others) then check out http://freshrpms.net