If I have a Java project in Eclipse, I can right-click on a method name and \"Open Call Hierarchy.\" Suppose I have two interfaces, A and B, that both specify a method x().
Eclipse should already do this. If you want to test it, go to your A interface, select the x() method and run 'Open Call Hierarchy' on it. Do the same for your x() method in interface B. You should get different code locations, unless you have a class which implements both, which you should never do. Doing so won't break any compilation or execution, you will just be doubly declaring the same method signature.