同时进行多线程操作，并严格按照顺序处理任务 同时进行多线程操作，并严格按照顺序处理任务

 package com.example.demo.util;

    
  
    
 import java.util.concurrent.*;
    
  
    
 public class ManyThread {
    
     static ExecutorService executorService = Executors.newCachedThreadPool();
    
     static ExecutorService executorService1 = Executors.newSingleThreadExecutor();
    
  
    
     public static void main(String[] args) {
    
 //        sequentialExecution();
    
     countDownLatchTest();
    
     }
    
  
    
     public static void countDownLatchTest() {
    
 //        CountDownLatch 指定线程执行完毕，在执行操作
    
     //同时执行线程
    
     CountDownLatch countDownLatc