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The java editor shows marker for methods which are part of an implemented interface (white rectangle) or which overwrite a method from a superclass (green rectangle). There is no rectangle if a subclass of the open java file overwrites the method. It would be a nice feature because you will see at once if there exist subclasses which will be not affected by method changes (because they overwrite the method and don't call super).
*** Bug 70771 has been marked as a duplicate of this bug. ***
There's a pre-existing plugin to do this. 'Implementors' I think is what it's called. Very useful, but it still doesn't have the visual cue in the editor (last time I checked).