When I'm editing a java class in Eclipse, when my cursor is over a class variable. If I do Ctrl+T, it will popup a hover that shows all its parents and subclasses. What is the equivalent in IntelliJ?
Example:
Use|r user = new User();
The pipe is my cursor.
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".
View | 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.