Which exercise learnd you the most?

Hi,
I would like to know good exercises to improve my programming. I'm a beginnier and the most advanced program I made is a pokergame where the user interact through command line, that means no Swing classes. I also know algorithms like recursion, polymorphism, inheritance and so on..
Now hit me, what should be my next project? I would like to learn DB-modeling, I know nothing about that. I also want to learn more about I/O-streams in Java, for example, how you read data from the webb in to an application?
But these are just topic-suggestions from me, if you have other exercises that you think is good I take them too..
PS. I know google can help for exercises, but I want to know which one learnd YOU the most.
Edited by: Ani_Skywalker on Jun 27, 2008 4:31 AM

DrLaszloJamf wrote:
My advice is not to rush into Swing or JSP/servlets. Learn more Java first. You mentioned I/O. What about the collections framework? XML processing? JDBC? Some frameworks the Hibernate and Spring? Design Patterns?Collection framework. No.
XML. No.
JDBC. Began to look at it this morning, after I opened this thread.
Frameworks. Some Swing but I would say no.
Design Patterns. Come cross this before, but no. I can't say that I know it...
I'm gonna stick whit command line for the moment. I don't get to excited about GUI:s because I can put almost everything that I can code into a GUI, and the other way around. Therefore I think, just like some of you wrote, that I need to improve my Java. When I reach a level were I can't put my code in GUI:s, then I probably get excited about it...

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