Technically you can. You can use any text editor (just make sure it saves as .java), any decompiler to decompile the mods (like Java Decompiler, to make .java files), and any compiler to recompile everything (like Eclipse, to make .class files).
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Has nice day!
Please no PMing, and no, I'm not a moderator.
EDIT: What do I use to edit .class files?
Please no PMing, and no, I'm not a moderator.