I would like to find where an abstract method is implemented, in which class? Is there a link in Eclipse like call hierarchy/open declaration or something like that that shows where the method implemented is?
Quick methods:
Hold Ctrl, hover over the method name, and select "Open Implementation".
Click on the method name and press CtrlT.
Right-click on the method name → "Quick Type Hierarchy".
For more navigation power, see the post by ADTC.