多线程的插队与状态监测

public class JoinThread implements Runnable {
    public static void main(String[] args) throws InterruptedException {
        JoinThread JoinThread = new JoinThread();
        Thread thread = new Thread(JoinThread);
        thread.start();
        for (int i = 0; i < 1000; i++) {

            if (i == 200) thread.join();   //线程插队
            System.out.println("执行Main线程！" );
        }
    }

    @Override
    public void run() {
        for (int i = 0; i < 100; i++) {


            System.out.println("线程插队了！" + Thread.currentThread().getName());
        }
    }
}

package Pratice;
//观测线程
//利用state来观测线程
public class SeeThread {

    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) {
                    e.printStackTrace();
                }
            }
            System.out.println("///");
        });

        //观察线程,枚举类State
        Thread.State state=thread.getState();
        System.out.println(state);//新建状态NEW

        //观察启动后
        thread.start();//启动线程Runnable
        state=thread.getState();
        System.out.println(state); //Run

        while(state!=Thread.State.TERMINATED){
            //只要线程不终止，就会一直输出状态,terminated终止
            Thread.sleep(100);
            state=thread.getState();//更新状态
            System.out.println(state);
        }
    }
}