I recommend that you subclass ThreadGroup and then create one (or more) join-methods in that class.

When the join method is called just iterate and join the threads in the threadgroup.

public class ExtendedThreadGroup extends ThreadGroup{

public ExtendedThreadGroup(String aName){

super(aName);

}

public ExtendedThreadGroup(String aName, ThreadGroup

aThreadGroup){

super(aName,aThreadGroup);

}

public void join(){

Thread threads[];enumerate(threads);

for(int i= 0;i
threads[i].join();

}

}



Thats IT ;)

Yes. Just join to each one in turn. That way, when the loop exits, you know that all the threads have exited -- whether it was the first thread or the seventh thread that took the longest, all threads will be waited for. Remember, join() on a thread that's already exited takes no time.

Iterator i = myThreads.iterator();
while (i.hasNext()) {
  ((Thread)i.next()).join();
}