三个线程依次顺序执行

1.JOIN

package com.gupao.forkjoin;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 功能：
 *
 * @author kangping
 * @date 2022-07-05 6:56 下午
 */
public class Main {

    public static void main(String[] args) {
        final Thread t1 = new Thread(new Runnable() {
            public void run() {
                System.out.println(Thread.currentThread().getName() + " run 1");
            }
        }, "T1");
        final Thread t2 = new Thread(new Runnable() {
            public void run() {
                try {
                    // t2 线程阻塞 等待t1线程执行完
                    t1.join(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + " run 2");
            }
        }, "T2");
        final Thread t3 = new Thread(new Runnable() {
            public void run() {
                try {
                  // t3 线程阻塞 等待t2线程执行完
                    t2.join(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + " run 3");
            }
        }, "T3");
        t1.start();
        t2.start();
        t3.start();
    }

}


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2.线程池

newSingleThreadExecutor 里面只有1个线程，依次执行run方法

package com.gupao.forkjoin;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 功能：
 *
 * @author kangping
 * @date 2022-07-05 6:56 下午
 */
public class Main {

    public static void main(String[] args) {
        final Thread t1 = new Thread(new Runnable() {
            public void run() {
                System.out.println(Thread.currentThread().getName() + " run 1");
            }
        }, "T1");
        final Thread t2 = new Thread(new Runnable() {
            public void run() {
                try {
                    t1.join(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + " run 2");
            }
        }, "T2");
        final Thread t3 = new Thread(new Runnable() {
            public void run() {
                try {
                    t2.join(10);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println(Thread.currentThread().getName() + " run 3");
            }
        }, "T3");

        ExecutorService executorService = Executors.newSingleThreadExecutor();
        executorService.submit(t1);
        executorService.submit(t2);
        executorService.submit(t3);
    }

}


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