package 第二章.守護線程;

/**
 * Created by zzq on 2018/1/18.
 */
public class 守護線程Test {
   public static class MyThread extends Thread{
        private int i = 0;
        @Override
        public void run(){
            super.run();
            try{
                while(true){
                    i++;
                    System.out.println("i="+i);
                    Thread.sleep(1000);
                }
            }catch(InterruptedException ie){
                ie.printStackTrace();
            }
        }
    }
 public static    class testThread extends Thread{
        @Override
        public void run(){
            try{
                Thread.sleep(10000); //testThread線程約10秒後結束
                System.out.println(Thread.currentThread().getName()+"線程結束！");
            }catch(InterruptedException ie){
                ie.printStackTrace();
            }
        }
    }
    public static class T1 extends Thread{
        @Override
        public void run() {
            for (int i = 0; i < 10; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(i);
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        try{
            MyThread thread = new MyThread();
            thread.setName("thread");
            thread.setDaemon(true); //將thread線程設為守護線程
            thread.start();
            testThread t = new testThread();
            t.setName("testThread");
            t.start();
            t.stop();
            Thread.sleep(5000);//main線程在這裏停留5秒
            System.out.println("主線程結束了");//5秒後main線程結束了，但是testThread線程還在執行，所以守護線程繼續工作

   /*當所有線程都結束時，thread線程也隨之結束*/
        }catch(InterruptedException ie){
            ie.printStackTrace();
        }
        /*守護線程 必須在start（）方法之前 不然會報錯，告訴你設置守護線程失敗
        public final void setDaemon(boolean on) {
        checkAccess();
        if (isAlive()) {
            throw new IllegalThreadStateException();
        }
        daemon = on;
    }
         源碼中說明  如果線程的運行狀態是true 會拋異常
         */
    }
}

2.5 駐守後臺：守護線程