Eclipse: Most useful refactorings [closed]

It is an interesting question. I know what works for me and it is interesting to see what others use.

I decided to take a more scientific approach to determine the most commonly used refactoring commands. Eclipse has a Usage Data Collector (UDC) feature built in. The data is publicly available. I took the data and extracted the following graph which shows the most commonly used editing commands (without navigation commands).

alt text http://img.skitch.com/20091207-bmcng36rjy837sqmcx58b85age.gif

However, I am a strong believer in "Save Actions" for formatting and organizing imports (read my article about it), so I wouldn't count those. I would also remove the commenting actions. The picture looks like this: alt text http://img.skitch.com/20091207-ieas1mk5114fwitucqkqxyw6t.gif

Rename - because giving things meaningful names is the best way to write self-documenting code. Shift+Alt+R

Extract method - whenever a method gets too long. Shift+Alt+M

Extract constant - because magic numbers are bad. Shift+Alt+T (refactoring menu, there's no direct shortcut).

Inline/introduce variable - to remove clutter from methods. Shift+Alt+I (inline), Shift+Alt+L (introduce)

My favourites (in order of using):

1. Rename (Alt-Shift-R, or Ctrl-1 for faster in-file renaming)
   Good renaming variables,methods,etc. without side effects.
2. Extract Variable (Ctrl-1, Alt-Shift-L)
   Good for splitting a quick-made-100-character-line to separate steps.
3. Extract Method (Alt-Shift-M)
   Create a method out of some code without any side effects.
4. Split Variable Declaration (Ctrl-1)
   Good when you initialize a variable at the declaration and now find out, that the initialisation needs to be in a try- or if-block.
5. Change Method Signature (Alt-Shift-C)
   The handy Swiss Army Knife of method signature manipulation, including default values for new parameters.
6. Pull Up/Push DownPull methods and variables to a generic interface or superclass or push it down to a subclass
7. Extract Interface/Superclass
   Extract an interface or a superclass out of the current class. Very handy.