!7

sclass ManySleepingThreads extends DynPrintLog {
  int number = 5;
  transient JTextField tfNumber;
  
  transient L<Thread> threads;
  
  JComponent visualize() {
    ret northAndCenterWithMargins(centerAndEastWithMarginInbetween(withLabel("Number of threads:", tfNumber = jLiveValueTextField(dm_fieldLiveValue('number))),
      jbutton("Make threads", rThread makeThreads)),
      super.visualize());
  }
  
  void makeThreads {
    temp enter();
    interruptThreads(getAndClearList(threads));
    if (tfNumber != null) setField(number := parseInt(gtt(tfNumber)));
    for i to number: {
      threads.add(startThread("Sleeper", r sleep));
      print("Made thread " + (i+1) + "/" + number);
    }
  }
}