Running only one instance of an application.

[Alok Pota]

I have a simple application called "Test.java" which looks like this
public class Test {
public static void main(String[] args) {
while(true) {
Thread.sleep(60000);
System.out.println("Alive "+this);
}
}
When I run this program through my IDE (netbeans), i think the java runtime spawns of a process corresponding to this application (which shows up in my task manager as a java process). How can I make it so that when I try to run this program again, I kill the original process and start the new one, i.e., when I press (say F5 for run..) the original Java process is killed
and a new one corresponding is created. So at any given time I can have only one java process corresponding to that application

[Colin Kenworthy]

Would a "singleton" class help here? i.e. a class that has just one instance of itself.

[Alok Pota]

I afraid not. I just realized that running different instances of a public static main() class actually show up as different java processes in your task manager. I am not sure if there is a good way to limit the number of such java processes programmtically from within java, as there are no hooks provided to deal with the underlying OS.