As I start to learn Java I am going to document some of the shortcuts I find and / or people show me (more likely)- very helpful.
F4 – Class hierarchy
Click on a Class
F4
Sweet
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Xomino 
Tim Tripcony and I talked about making T-shirts with F3 and F4 keys on the front, and printed on the back would be “I’m reading your code.”
F3 is particularly fun with the right plugins.