Java使用单线程池实现多线程顺序执行（不交替，未同步）

港控/mmm° 2022-12-23 03:27 99阅读 0赞

### 1、原理机制 ###

使用单线程池，保证提交和执行是有序的。

说明：

1）不支持线程之间交替继续执行。

2）多线程之间并非同步，只保证执行顺序有序，多线程之间是并发执行。

### 2、代码示例 ###

package com.thread;
    
    import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    import java.util.concurrent.locks.Condition;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    
    public class TasksWithoutLockTest extends Thread {
    
        private static int num = 0;
        private int id;
    
        public TasksWithoutLockTest(int id) {
            this.id = id;
        }
    
    
        @Override
        public void run() {
            System.out.println("Thread" + id + "执行结果num:" + num++);
            try {
                Thread.sleep(3);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    
        public static void main(String[] args) {
            //ExecutorService exec = Executors.newFixedThreadPool(1);
            ExecutorService exec = Executors.newSingleThreadScheduledExecutor();
            for (int i = 0; i < 12; i++) {
                exec.submit(new TasksWithoutLockTest(i));
            }
    
            exec.shutdown();
    
        }
    }

### 3、输出结果 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYWhhbzExODY_size_16_color_FFFFFF_t_70][]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYWhhbzExODY_size_16_color_FFFFFF_t_70]: /images/20221120/05275a3a371640ee81c3af168fa7eba2.png