In Java, interfaces cannot see their implementation classes and do not support direct navigation to the implementation classes.

[CNlanny]

[rgrunber]

There are many different ways that we support this :

Through Code Lens

Set "java.implementationCodeLens": "all" (or even "types")
(note the 15 implementations, which allows you to navigate)

"Go To Implementations", "Find All Implementations" & "Type Hierarchy"

There's "Go To Implemetations" and "Find All Implementations". One will create a peek dialog where you can browse the implementations without leaving the current editor, while the other will generate a reference view with all the implementations. "Type Hierarchy" should also show the implementations.

Let me know if any of these work for you. The context menu approach definitely is slightly remove from direct navigation, but many of those options can be bound to a key.