多线程的创建与使用（二）

多线程（二）

线程的状态

• 创建状态

• 就绪状态

• 阻塞状态

• 运行状态

• 死亡狂态

  如何停止线程

  package base.duoxiancheng.Demo05;
  
  public class TestSop implements Runnable {
      private boolean flage=true;
  
      @Override
      public void run() {
          int i=0;
          while (flage){
              System.out.println("线程运行在"+i++);
          }
      }
      public  void stop(){
          this.flage=false;
      }
  
      public static void main(String[] args) {
          TestSop testSop=new TestSop();
          new Thread(testSop).start();
          for (int i = 0; i <1000 ; i++) {
              if (i==900){
                  testSop.stop();}
              {  System.out.println("运行中"+i);
              }
  
          }
      }
  }
  
  

建议让线程自己停下，建议设置一个标志位的终止变量，同个flag的true或者false来终止线程

线程的休眠 Sleep

sleep（设置休眠的毫秒值）

sleep需要有一个异常来抛出

sleep时间到达之后会让线程进入就绪状态

sleep用于模拟延迟或者倒计时

每个对象都有一把锁，但是sleep不会释放锁

模拟倒计时

package base.duoxiancheng.Demo06;

public class Sleeptest implements Runnable {
    private boolean flag=true;

    @Override
    public void run() {

        for (int i = 0; i <=10 ; i++) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                throw new RuntimeException(e);
            }
            System.out.println(+i);
            if (i==10)
                break;



        }


    }

    public static void main(String[] args) {
        Sleeptest sleeptest =new Sleeptest();
        new Thread(sleeptest).start();
    }
}

## 探知此时线程的状态

package base.duoxiancheng.Demo07;

public class TestState {
    public static void main(String[] args) throws InterruptedException {
        Thread thread =new Thread(()->{
            for (int i = 0; i < 5; i++) {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {

                }

            }
            System.out.println("/////");

        });
        Thread.State state = thread.getState();
        System.out.println(state);
        thread.start();
        while (state!=Thread.State.TERMINATED){
            Thread.sleep(100);
            state=thread.getState();
            System.out.println(state);
        }

    }
}

运行结果

NEW
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
TIMED_WAITING
/////
TERMINATED

线程的优先级

        thread.setPriority(优先级（1-10）);
        这个一定要在线程运行之前 thread.start之前