java decomplier

My collegue left the company without any notice.
I assigned to his job and can't find his java code but a bunch of class files.
Is there java decomplier programs?
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yowkee, I have try Mocha
What is the best decompiler, do you think ?

Jad ,the best and the fastest C++ based one.
Use it with options like

jad  -b -stat -o -r -dead -ff -i -noctor -nocast -sjava YorClass.class

  I do feel Jad is good. but I can't say which is the best, since I've never try all of them, at least not on a big project.
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