代碼運行結果線程顯示混亂，看不出問提出在哪？

package com.imooc;

public class Stage extends Thread {

?

public void run()

{

System.out.println("歡迎觀看隋唐演義");

try {

Thread.sleep(5000);

} catch (InterruptedException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

System.out.println("大幕徐徐拉開");

//舞臺線程休眠

try {

Thread.sleep(5000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

Thread.sleep(5000);

} catch (InterruptedException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

System.out.println("話說隋朝末年，隋軍與農民起義軍殺的昏天黑地");

ArmyRunnable armyTaskOfSuiDynasty = new ArmyRunnable();

ArmyRunnable armyTaskOfRevolt = new ArmyRunnable();

//使用Runnable接口創建線程

Thread armyOfSuiDynasty = new Thread(armyTaskOfSuiDynasty,"隋軍");

Thread armyOfRevolt = new Thread(armyTaskOfRevolt,"農民起義軍");

//啟動線程，讓軍隊開始作戰

armyOfSuiDynasty.start();

armyOfRevolt.start();

//舞臺線程休眠，專心觀看軍隊廝殺

try {

Thread.sleep(50);

} catch (InterruptedException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

}

System.out.println("雙方激戰正酣，半路殺出個程咬金");

Thread mrCheng = new KeyPersonThread();

mrCheng.setName("程咬金");

System.out.println("程咬金的理想就是結束戰爭，使百姓安居樂業！");

//軍隊停止作戰

armyTaskOfSuiDynasty.Keeprunning = false;

armyTaskOfRevolt.Keeprunning = false;

try {

Thread.sleep(2000);

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

mrCheng.start();

try {

mrCheng.join();

} catch (InterruptedException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

System.out.println("戰爭結束，人民安居樂業，程先生實現了積極的人生夢想，為人民做出貢獻");

System.out.println("隋唐演義結束，謝謝");

}

public static void main(String[] args) {

new Stage().start();

}

}