驻守后台：守护线程

package 第二章.守护线程;

/**
 * Created by zzq on 2018/1/18.
 */
public class 守护线程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线程约10秒后结束
                System.out.println(Thread.currentThread().getName()+"线程结束！");
            }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); //将thread线程设为守护线程
            thread.start();
            testThread t = new testThread();
            t.setName("testThread");
            t.start();
            //t.stop();//已经过期
            Thread.sleep(5000);//main线程在这里停留5秒
            System.out.println("主线程结束了");//5秒后main线程结束了，但是testThread线程还在执行，所以守护线程继续工作

   /*当所有线程都结束时，thread线程也随之结束*/
        }catch(InterruptedException ie){
            ie.printStackTrace();
        }
        /*守护线程 必须在start（）方法之前 不然会报错，告诉你设置守护线程失败
        public final void setDaemon(boolean on) {
        checkAccess();
        if (isAlive()) {
            throw new IllegalThreadStateException();
        }
        daemon = on;
    }
         源码中说明  如果线程的运行状态是true 会抛异常
         */
    }
}