我跟着老师打的，为什么会出错？

Thread armyOfDynasty = new Thread(armyTaskOfSuiDynasty, "隋军");

//这句出错，错误：   The constructor Thread(ArmyRunnable, String) is undefined

Thread armyOfRevolt = new Thread(armyTaaskOfRevolt, "农民军");

//这句同上错误

armyOfDynasty.start();

armyOfRevolt.start();

try {

Thread.sleep(50);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

armyTaskOfSuiDynasty.keepRunning = false;//这句出错，错误是：keepRunning cannot be                                                                             //resolved or is not a field

armyTaaskOfRevolt.keepRunning = false;//这句同上