You can reveal an element's location in the Package Explorer view
Select a Java element or activate a Java editor.
From the menu bar, select Navigate > Show
In > Package Explorer. If the Package
Explorer is not already open, then it opens in the current perspective.
The workbench navigates to the selected element (or the edited
compilation unit).
From the Java editor's pop-up menu, select Show In >
Package Explorer. The currently edited compilation unit will be
revealed.
Note: The element might not be revealed if Package
Explorer filters are active or the Show Members in Package
Explorer preference is cleared on the Java >
Appearance preference page.
Java >
Appearance preference page.