day21 线程终止与休眠

线程停止

1. 让线程正常停止 利用循环不能死循环

2. 使用标志位 设置标志位

3. 不用stop函数和destroy

    1  public class TestStop implements Runnable{
    2  ​
    3      //1. 设置一个标志位
    4      private boolean flag = true;
    5      @Override
    6      public void run() {
    7          int i = 0;
    8          while (flag){
    9              System.out.println("run....thread "+i++);
   10          }
   11      }
   12      //2. 设置一个公开的方法停止线程，转换标志位
   13      public void stop(){
   14          this.flag=false;
   15      }
   16  ​
   17      public static void main(String[] args) {
   18          TestStop testStop = new TestStop();
   19          new Thread(testStop).start();
   20          for (int i = 0; i < 1000; i++) {
   21              if(i==900){
   22                  //调用stop方法切换标志位，让线程停止
   23                  testStop.stop();
   24              }
   25          }
   26      }
   27  }

    

线程休眠

1. 模拟网络时延

 1 //模拟网络延迟
 2  public class TestSleep implements Runnable{
 3      //票数
 4      private int ticketNums =10;
 5      @Override
 6      public void run() {
 7  ​
 8          while (true){
 9              if (ticketNums<=0){
10                  break;
11              }
12              //模拟延时
13              try {
14                  Thread.sleep(200);
15              } catch (InterruptedException e) {
16                  e.printStackTrace();
17              }
18              System.out.println(Thread.currentThread().getName()+"-->拿到了第"+ticketNums--+"张票");
19          }
20      }
21  ​
22      public static void main(String[] args) {
23          TestSleep ticket = new TestSleep();
24          new Thread(ticket,"gugu").start();
25          new Thread(ticket,"zizi").start();
26          new Thread(ticket,"haohao").start();
27  ​
28      }
29  }

2. 模拟倒计时

 1  // 模拟倒计时
 2  public class TestSleep2 {
 3      public static void main(String[] args) {
 4  ​
 5          try {
 6              tens();
 7          } catch (InterruptedException e) {
 8              e.printStackTrace();
 9          }
10          //打印当前系统时间
11          Date startTime = new Date(System.currentTimeMillis());//获取系统当前时间
12          while(true){
13              try {
14                  Thread.sleep(1000);
15                  System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
16                  startTime = new Date(System.currentTimeMillis());//更新时间
17              } catch (InterruptedException e) {
18                  e.printStackTrace();
19              }
20  ​
21          }
22  ​
23      }
24      public static void tens() throws InterruptedException {
25          int num =10;
26          while (true){
27              Thread.sleep(1000);
28              System.out.println(num--);
29              if (num<=0){
30                  break;
31              }
32          }
33      }
34  }