Cleanup before exiting Java application

Question

I'm writing a small Java application using Swing. The application also has a networking component.

I want to run some code before exiting(close channels, keys, etc).Is there a way to do this, without adding an Exit button in my interface, in which to do my cleanup, then do System.exit()?

Answer 1

You can use the Runtime#addShutdownHook function to add a function to run when the JVM shuts down.

Answer 2

You should be able to do what you want in windowClosing(), shown here.