JFrame setVisible（false）和setState（Frame.ICONIFIED）之间的差异

Question

In Swing, we can hide JFrame by using two methods:

1. frame.setVisible(false)
2. frame.setState(Frame.ICONIFIED)

The difference that I discover are:

1. frame.setVisible(false) removes icon from taskbar whereas ICONIFIED doesn't.
2. We can add listener to ICONIFIED whereas we can't add it for frame.setVisible(false) .

Is there other major difference I'm missing? Any ideas would be greatly appreciated.

Answer 1

With setVisible(false), if the Component is not already marked invisible, setVisible calls invalidate() which invalidates the Container's layout and the chain of parents since there is now more screen real estate in the Container and the positions of the siblings must be adjusted to flow into the freed space.

API of Component .

But the ICONFIED is doing the minimize process of a window.

Answer 2

We can add listener to ICONIFIED whereas we can't add it for frame.setVisible(false).

You can use a ComponentListener and handle componentHidden(...) .

Answer 3

The major differences as I know are as follows:
1) frame.setState(Frame.ICONIFIED) just changes the state of the frame whereas frame.setVisible(false) changes visibility of frame.
2) setState(Frame.ICONIFIED) method in class java.awt.Frame can programmatically minimize a frame and setState(Frame.NORMAL) to restore it.
3) Invisible frame cannot use any listener but you can add listener to frame that is ICONIFIED.
4) frame.setVisible(false) removes the physical state of frame from screen whereas setState(Frame.ICONIFIED) just changes state preserving its physical state.

These two methods have their own characteristics so be more confident in choosing one that is more suitable for your situation.