Help with school project?

I am still in school and studying java, I am kind of new to it(I have been working in Delphi for 2 years and only recently started working with java...) as well and really need help with a project. For my last term I need to write a program that allows the user to play the game mastermind.
I have a few problems that I can't seem to figure out...

firstly I have an error and I don't know what it means:
java.lang.NoClassDefFoundError: toets
Caused by: java.lang.ClassNotFoundException: toets

secondly I don't know how to save data on the computer after it has been entered, say if I used a JOptionPane and this person entered their name and played a game and won, how and where can I save this information so that it will still be found the next time they log on? I want to use a text file (.txt) but I don't know how[color=Purple]??[/color]

[U]Please[/U] Help me !!!
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