package?com.imooc.concurrent.base; public?class?ArmyRunnable?implements?Runnable?{ //volatile保證了線程可以正確讀取其他線程寫入的值 volatile?Boolean?keepRunning?=?true; @Override public?void?run()?{ while(keepRunning){ for(int?i=0?;?i<5?;?i++){ System.out.println(Thread.currentThread().getName()+"進攻對方"+(i+1)+"次"); //緩沖，釋放內存，給予士兵休息的時間 Thread.yield(); } } System.out.println(Thread.currentThread().getName()+"結束了攻擊"); } }package?com.imooc.concurrent.base; public?class?Stage?extends?Thread?{ public?void?run(){ 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，開始作戰 armyOfsuiDynasty.start(); armyOfRevolt.start(); try?{ //舞臺線程休眠，專心觀看廝殺 Thread.sleep(50); }?catch?(InterruptedException?e)?{ //?TODO?Auto-generated?catch?block e.printStackTrace(); } armyTaskOfSuiDynasty.keepRunning?=?false; armyTaskOfRevolt.keepRunning?=?false; try?{ armyOfRevolt.join(); }?catch?(InterruptedException?e)?{ //?TODO?Auto-generated?catch?block e.printStackTrace(); } } public?static?void?main(String[]?args)?{ new?Stage().start(); } }是怎么結束的，因為while是一個無限循環，代碼是怎么運行到armyTaskOfSuiDynasty.keepRunning?=?false; armyTaskOfRevolt.keepRunning?=?false;這里的，可能我表達的意思不清楚，就是說這個while循環是怎么停止的