Can't get JDK to work! Please help!

Hi, I have downloaded the JDK1.3.1 many times and I have try installing it into different computers at home but none of them work. Is there like an online thing where I can compile my code and run it. Because at home it seems not to work but in school it's fine and I really need to practice alot at home

What is your OS platform used? Check out the URL below:
http://java.sun.com/docs/books/tutorial/getStarted/cupojava/index.html
Good luck!

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