Eclipse's "Outline" window equivalent in IntelliJ

I think you're looking for this:

To view the file structure, do one of the following

• On the main menu, choose View | Tool Windows | Structure.
• Pres StructureTool Button
• Press Alt+7.
• Press Ctrl+F12.

File structure popup shortcut:

• Windows: CTRL+F12
• Mac: ⌘+F12