Eclipse Tip: Show method body from calling method

If you have a method call somewhere in the code, you will notice that
placing the mouse pointer over the method call displays basic
information about that method. That information includes the method
signature, and method and parameters description.

But there is also a useful and not always known shortcut (at least I
had missed on this one).
If instead of just moving the pointer over the method call, you press
the Ctrl key and then place the mouse pointer as stated before, the
whole body of the method being called will be displayed. Moreover,
releasing the Ctrl key and pressing F2 instead will open the usual
focus window allowing for easier reading.