How to show all parents and subclasses of a class in IntelliJ IDEA?

Navigate | Type Hierarchy Ctrl+H will show similar information, however in the Panel. You can Float and Unpin the Panel so that it appears on the fixed display position only when you use the keyboard shortcut.

In terms of behavior the equivalent of Eclipse Ctrl+T in IntelliJ IDEA is Ctrl+Alt+B

Not an IntelliJ IDEA user, but this blog post seems to indicate that in version 8.1.1 and beyond Ctrl+Alt+U will display the "Quick Class Hierarchy".

Intellij does - in contrast to Eclipse - distinguish between type hierachies and implementation classes. I'm still undecided whether this is a good thing or not (just switched over from Eclipse to Intellij myself)

On a Mac Intellij 14

Ctrl + H will bring up the type hierarchy showing you sub- and supertypes

Cmd + Alt + B will show you all implementing classes and subclasses of the interface/class you're interested in

Also try CTRL+SHIFT+A in case of any doubt. The short cut for short cut information.

In IntelliJ IDEA 12, it's Navigate > Type Hierarchy (Ctrl+H by default).

For Mac users who come here, this is the shortcut for IntelliJ 14.1.4:

⌃+H by default.

For Mac Users, the shortcut is

^(control) + h

In IntelliJ 13, it's Navigate > Implementations or CMD + ALT + B by default. Of course, this shortcut can be overridden in your Keymap preferences.

With Eclipse, hitting Ctrl+T on a type displays its subtypes and hit again Ctrl+T displays so supertypes. And so for... this is a toggle. That is really helpful and also very straight.

Unfortunately with IntelliJ, the switch between the supertypes and the subtypes doesn't have any default shortcut. So you will have to click on the icons of the hierarchy windows. If like me you favor the keyboard shortcuts to the "move cursor and click on mouse" option, I encourage you to set a binding for these two operations. For example Ctrl+Down for subtypes and Ctrl+Up for supertypes.

https://i.stack.imgur.com/iO59l.png

Note that these bindings are contextual to the "Other" context (Eclipse does have a similar enough concept). 1) In this way, enter Ctrl+T on a ArrayList type produces :

https://i.stack.imgur.com/7NSrW.png

2) Enter Ctrl+Down focuses on subtypes :

https://i.stack.imgur.com/GxubU.png

3) And Enter Ctrl+Up focuses on supertypes :

https://i.stack.imgur.com/GxubU.png

In this way, I find it better than the default behavior but to be honest even with that shortcut adding, the IntelliJ feature is not as good as Eclipse which the Ctrl+T shortcut also works on methods...

I don't know about prior versions, but in IntelliJ version 13 you can go into your Keymap preferences, search for "Implementations", and bind that to Ctrl+T. It will work very much like the Eclipse equivalent.

Whilst Eclipse includes the type hierarchy and class structure (methods, fields etc.) in a single view, IntelliJ splits these up: In addition to the CTRL+H (or ALT+8) "Type Hierarchy" view, the other relevant IntelliJ window is called "Structure" and can be invoked via ALT+7 (Structure Tool Window) or CTRL+F12(Structure popup).

(Not a direct answer to the exact question posted but would expect others from an Eclipse background may arrive here having googled for "intellij type hierarchy", as I did.)

Ctrl+U - go to base class

Ctrl+Alt+B - got to implementation. Type parts of class name to narrow down the list

Ctrl+H - open type hierarchy tool window

Ctrl+Alt+U - peek class/interface inheritance hierarchy

One more option to do this:

For Windows user:

Ctrl + Alt + Left mouse click on type, method etc.

https://i.stack.imgur.com/SD7XD.png

There is a hierarchy view as in Eclipse, have a look at the menu View / Tool Windows / Hierarchy or press Alt-8 or F4.