Java sdk on ubuntu

I love Java, and I think I will be doing a lot of stuff in Java once I start out at Thoughtworks. They have given me some books to learn Java and Extreme Programming. Since I have six weeks between leaving college and joining Thoughtworks, I had decided that I would do the studying once I am done with college.
One of my prime concerns when I switched to Ubuntu was how I will manage to do Java, as there is nothing like writing line os code to learn coding. So I spent most of the morning downloading and installing the Java6-SDK from Sun. It took a lot of time (127 MB) if I remember right and it was a real pain waiting for the download to complete, because many of the guys with whom I share the internet connection had decided to download stuff at exactly the same time.
But when the download finished,the installation took very little time.
And finally I sat about checking if I had got everything right. All the code I had written some 18 months ago, when I was really in to learning Java worked. I was pleasantly surprised to see the LAN chat application I wrote, in the projects folder. And it worked.
(It brought back lots of memories, of night-outs spent learning Java, broken only by the tea from the hostel snacks-bar at around midnight, and by the sheer struggle to get your hands on as much Porottas and pieces of mutton as you possibly could from the take-away bag from 'Buhari'. For those who dont kno Buhari, it is a small restaurant in Trivandrum that works almost around the clock and belts out a great combination of very very tasty mutton curry and 'Puttu'. We preferred Porottas to 'Puttu'.)

I am beginning to look forward to the six week holidays, when I can spend some quality time with my father and hopefully learn lots of Java. I have doubts about the latter, but one thing is sure, when I take my computer home this month, it wont have Windows. Who want Windows when you have Linux ? :)