Disable or remove close button

1. Can we disable browser close button?
2. How do I remove a close button in JFrame?

Can we disable browser close button?

No, you can't disable the close button on any web site. This would be a major security concern. You can, however, use onbeforeunload to ask the user if they really want to leave, but they can still continue to close the window if they desire.

How do I remove a close button in JFrame?

To disable the close operation on a JFrame , when user click the close icon on the JFrame , we can set the value of the default close operation to WindowConstants. DO_NOTHING_ON_CLOSE .