Navigating a Long Class

There are various tips and tricks you can use to navigate a long class in IntelliJ IDEA

Classes can get long, but in IntelliJ IDEA you can quickly navigate between methods with ⌃⇧⬇ / ⌃⇧⬆ on macOS, or Alt+Down/Up Arrow on Windows/Linux. To improve your code readability you can also collapse or expand methods with ⌘- / ⌘+ on macOS, or Ctrl+Numpad - / Ctrl+Numpad + on Windows/Linux.