How many ways a java Program can end?

Question

I know use System.exit(0) can end a java program, for instance, if I have a JFrame window, it will close and end the program, but I wonder how many other ways, can it be closed and the program be ended ? Including when an error occurs, will the program be shut down and the JFrame be closed ?

Answer 1

To add to other answers:

• If the process that is hosting the VM is forcefully terminated, your program will spontaneously disappear
• The same happens if the plug gets pulled on the machine hosting the VM :)

Answer 2

A Java program ends when the last Thread without daemon flag ends, or when you call a method that shuts down the virtual machine (System.exit(), Runtime.exit(), Runtime.halt() and possibly a few more).

Anything else is up to libraries that call System.exit() (such as a JFrame with EXIT_ON_CLOSE).