vim eclipse java

tar -xzvf eclipse*.*.gz

mv eclipse  /opt/eclipse

ln -s /opt/eclipse /usr/bin/eclipse

run rpm in debain

I wouldn‘t recommend it. You probably could compile it but you wouldn‘t have any Ubuntu-compatible package repositories for it to handle.

You can convert single RPM files into DEBs with Alien:

sudo apt-get install alien
alien my_package.rpm
dpkg -i my_package.deb

Note: It might change the filename a little more than just the extension.

This won‘t work for everything as packages link to other packages to fulfil dependencies. Obviously Red Hat/Fedora/CentOS use different package names to Ubuntu so you‘re likely going to run into a whole load of pain.

Chances are if a DEB doesn‘t exist, you‘ll be better off just getting the source and compiling it.