code: private static void purgeQueue() {
  
          ChronoReference cref;
  
          while ((cref = (ChronoReference) QUEUE.poll()) != null) {
              for (ChronoReference test : CHRONOS) {
                  if (test.name.equals(cref.name)) {
                      CHRONOS.remove(test);
                      break;
                  }
              }
          }
  
      }
docs: vom GC behandelte Referenzen wegräumen