Answer:
No. In a complex application with many frames, you probably want only to close the frame who's button you clicked. You probably want to keep the application running.
setDefaultCloseOperation()
The setDefaultCloseOperation() method is
used to specify one of several options for the close button.
Use one of the following constants to specify your choice:
- JFrame.EXIT_ON_CLOSE — Exit the application.
- JFrame.HIDE_ON_CLOSE — Hide the frame, but keep the application running.
- JFrame.DISPOSE_ON_CLOSE — Dispose of the frame object, but keep the application running.
- JFrame.DO_NOTHING_ON_CLOSE — Ignore the click.
If you forget to call setDefaultCloseOperation()
you will get JFrame.HIDE_ON_CLOSE by default.
This can be frustrating,
because it looks like you have "killed" the program,
but it keeps on running,
and you see no frame.
QUESTION 9:
Could different frames pick different close operations?