How to execute a set of commands when exiting a java program?

Question

i want to execute a particular set of commands when the program exits by pressing the cross on the right hand top corner

Answer 1

Depending of what you really want to do, there are few ways to do it:
1) If you want to do it on UI level use WindowListener [link]
2) If you want to do it on JVM level, use ShutdownHooks [link]