There is not a built-in option for this. You would need to configure a custom quick list to do such.
- Open the Settings dialog and go to "Quick Lists" (It's under "Appearance & Behavior" in IDEA 14)
- Click the add button
to the right of the middle pane - Give your list a name
- Click the add button
to the right of the far right pane (where is reads "no actions") - Add the Go to Declaration action (Main Menu > Navigate > Go to Declaration)
- Add the Go to Implementation(s) action (Main Menu > Navigate > Go to Implementation(s))
- Click Apply
- Go to Keymap in the settings
- Under the "Quick List" node, find the Quick List you just created and map a short-cut (keyboard or mouse) to it. You can, of course, remap one of the shortcuts used by the Go to Declaration or the Go to Implementation(s) action
- Click OK to close out of the settings and give it a try.
Note that in the quick list that opens, you will have numbers next to each action for quick selection.
Edit: Adding a screenshot of final quick list for additional clarity

There is not a built-in option for this. You would need to configure a custom quick list to do such.
- Open the Settings dialog and go to "Quick Lists" (It's under "Appearance & Behavior" in IDEA 14)
- Click the add button
to the right of the middle pane - Give your list a name
- Click the add button
to the right of the far right pane (where is reads "no actions") - Add the Go to Declaration action (Main Menu > Navigate > Go to Declaration)
- Add the Go to Implementation(s) action (Main Menu > Navigate > Go to Implementation(s))
- Click Apply
- Go to Keymap in the settings
- Under the "Quick List" node, find the Quick List you just created and map a short-cut (keyboard or mouse) to it. You can, of course, remap one of the shortcuts used by the Go to Declaration or the Go to Implementation(s) action
- Click OK to close out of the settings and give it a try.
Note that in the quick list that opens, you will have numbers next to each action for quick selection.
Edit: Adding a screenshot of final quick list for additional clarity

I was looking for the same thing, because I was also used to it in Eclipse. Nevertheless, in 99% of the cases, I went to the implementation. If that's your case too, you may consider changing the Ctrl+click shortcut in IntelliJ:
- Open File โ Settings... โ Keymap
- Search for "implementation", and identify the item "Main menu โ Navigate โ Implementation(s)" in the list
- Right-click the item and choose "Add Mouse Shortcut"
- Add the Ctrl+click shortcut by making a Ctrl+left click on the window
- When hitting the OK button, you have two choises :
- Remove the existing shortcut (opening the declaration)
- Leave the existing shortcut : In that case, when using then Ctrl+click, both the declaration and the implementation will be opened (at least when they are in different files)
I know this answer comes like 2 years too late, but hopefully it may help others?
EDIT : This shortcut also applies when you want to navigate to the declaration of a super class. Therefore, my "99%" first declared above drops a bit. I've added the ctrl + right-click as a shortcut to go the declaration (which conflicts with no other shortcut - but you need a mouse with at least two buttons...).
Yes, On mac, it is Command + Option + B. You will need to move your cursor to the interface name before invoking the shortcut. I'm not sure what's the shortcut in PC, for if you right click the interface name -> "Go To" -> "Implementations"... the shortcut is listed there.
In Windows, it is CTRL + ALT + B: JetBrains navigation documentation.
In addition to Ctrl + Alt + B mentioned above, you can also use the mouse: Ctrl + Alt + LeftMouseButton to jump directly to implementations.
Right click on the root folder of your project (Application code folder) and
select -> Mark Directory as -> Sources root
I had the same issue with idea and i did:
- "Mark Directory As > Sources Root" not worked.
- "Invalidating cache and restart not worked"
- "Deleting .idea and .iml files not worked"
Finally right click on pom.xml and select "add as maven project" worked for me.
