How to break up a large .java file into several?

Hi,
I have a pretty large .java file containing many private methods. I rather not have to always work in this very large file. Is there a way to separate this into several smaller files, but to maintain the same relationship of all these private methods being part of the same class?
Thanks in advance,
Steve

I thought that would be the answer. This is my first
Java app. It uses Swing and I use NetBeans as my
IDE.
I knew it was getting too large, but I was trying to
avoid having to reimplement the whole thing. I have a
few more features to add and I can see this file
growing by another 300-400 lines.You'll find it a lot simpler to write the second time round. You really don't want to have classes that big
I do in fact have a couple other .java files where I
created separate classes. Its just that I really need
to rethink or redesign this whole thing.You do. Sounds like you've got one class that does too many things. What does this big class do? Adding new features shouldn't bloat your code this way

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