How to know threads status

Question

Hello all!
I want to know if all my threads are done.
I wrote some code but when I run it have this errors:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalMonitorStateException
        at java.lang.Object.wait(Native Method)
        at java.lang.Object.wait(Object.java:485)
        at gui.start.insertUserOpinion(start.java:177)
        at gui.start.searchButActionPerformed(start.java:145)
        at gui.start.access$000(start.java:36)
        at gui.start$1.actionPerformed(start.java:68)In my code I want to continue on my main function.
my code is:
     //creating threads by index of combobox
     for (i=0;i<=level.getSelectedIndex();i++){
     new myThread(list.get(i).toString(),model);
     //wait until all threads are done
     while  (myThread.activeCount()!=0)
     this.wait();
     }The error on the while loop
thanks for helping!!!

Answer 1

vitaly87 wrote:
But how do I know if all threads are done?When you have join()ed on each one of them. Like for example with your for loop there.
if I have more that one thread,and i create them with simple program not with anther thread.What?