Shortcut for "Key" related Help :
CTRL + Shift + L.
Function
Call Hierarchy : 
 CTRL+ALT+H
For adding
java doc comments to whole file : 
CTRL+ALT+J
Open any file quickly java ,jsp,xml etc : 
Ctrl + Shift
+ R
For Java
type in or outside workspace(like in jars) : 
 Ctrl + Shift + T
Go directly to a member (method, variable) : 
Ctrl + O
jump from one member to the next (or previous) : 
Ctrl + Shift
+ ↓ or Ctrl + Shift + ↑
Go to the last edit location: 
Ctrl + Q 
Go to a supertype/subtype: 
Ctrl + T.
Go to other open editors: 
Ctrl + E /