public class TT extends Thread {
 static final int RUN     = 0;
 static final int SUSPEND = 1;
 static final int STOP    = 2;
 private int state = RUN;

 public synchronized void setState(int s) {
  state = s;
  if (s == RUN) notify();
  }

 private boolean boolean checkState() {
  while (state ==  SUSPEND) {
   try {
    wait();
    }
   catch (Exception e) {}
   }
  if (state == STOP) 
   return false;
  return true;
  }

 public void run() {
  while true {
   doSomething();
   if (!checkState()) 
    break;
    }
}