Run code when pressing on the [x]

Question

I am making a distributed concurrent game online using Java and Swing. I want to remove the player's icon from the game zone when the user press the [x] to close the window. How can i say to the VM to execute a function before terminating the process?

Any attempts? Any code you can provide? – Cath Jul 07 '17 at 14:40 — Cath, Jul 07 '17 at 14:40

score 2 · Accepted Answer · answered Jul 07 '17 at 14:44

Assuming you are using a JFrame, set its default close operation do DO_NOTHING_ON_CLOSE and add a WindowListener to react on windowClosing.

This method can do what ever is needed and then just dispose the window to actually close it.

Note: this can also be used to ask the user if she/he really wants to exit...

score 0 · Answer 2 · answered Jul 07 '17 at 21:54

If you're using a JFrame, I think you should better write your own KeyEventDispatcher like described in that post: Unresponsive KeyListener for JFrame If you're just adding a KeyListener to a JFrame and you have selectable components placed on it, you have to add the listener to all these components too, presumably recursively.

You can then detect when somebody presses x and then call the dispose function of the JFrame. If you're also adding a WindowListener to your JFrame, you can put some code in the windowClosing method that is called before the frame closes.

Run code when pressing on the [x]

2 Answers2