dcsimg

How can I get the number of active Groups within a ThreadGroup?

Created May 8, 2012

Brandon Rohlfs

ThreadGroups activeGroupCount() returns the number of active groups within the ThreadGroup instance it was called upon. Once the number of active groups is obtained ThreadGroups enumerate(ThreadGroup[]) can be used to copy all refrences of the active subgroups into a ThreadGroup[]. 

class EnumTest{
 public static void main(String[] args){
  
  ThreadGroup tgp = new ThreadGroup("Parent"); 
  ThreadGroup tgc1 = new ThreadGroup(tgp, "Child 1");
  ThreadGroup tgc2 = new ThreadGroup(tgc1, "Child 2");
  
  ThreadGroup[] tg = new ThreadGroup[tgp.activeGroupCount()];
  tgp.enumerate(tg);  
  
  for(int i = 0; i < tg.length; ++i){
   System.out.println(tg[i].getName()); 
  }
 }
}