4.多线程按序打印

末蓝、 2024-04-28 07:27 9阅读 0赞

#### 文章目录 ####

*  题目简介
 *  题目解答
 *   *  代码：
 *  题目链接

**大家好，我是晓星航。今天为大家带来的是 多线程按序打印 相关的讲解！😀**

## 题目简介 ##

![image-20240331151031321][]

![image-20240331151040787][]

## 题目解答 ##

AtomicInteger原子类方法展示：

![image-20240331151640859][]

![image-20240331151717246][]

![image-20240331151540073][]

题目用到方法如上

### 代码： ###

class Foo {
        
    
      private AtomicInteger firstJobDone = new AtomicInteger(0);
      private AtomicInteger secondJobDone = new AtomicInteger(0);
    
      public Foo() {
        }
    
      public void first(Runnable printFirst) throws InterruptedException {
        
        // printFirst.run() outputs "first".
        printFirst.run();
        // mark the first job as done, by increasing its count.
        firstJobDone.incrementAndGet();
      }
    
      public void second(Runnable printSecond) throws InterruptedException {
        
        while (firstJobDone.get() != 1) {
        
          // waiting for the first job to be done.
        }
        // printSecond.run() outputs "second".
        printSecond.run();
        // mark the second as done, by increasing its count.
        secondJobDone.incrementAndGet();
      }
    
      public void third(Runnable printThird) throws InterruptedException {
        
        while (secondJobDone.get() != 1) {
        
          // waiting for the second job to be done.
        }
        // printThird.run() outputs "third".
        printThird.run();
      }
    }

![image-20240331152953013][]

借助AtomicInteger类来创建变量firstJobDone和secondJobDone，第一个线程无约束可以直接启动。然后再启动完成后让第一个变量设置增加一个当前值![image-20240331153247113][]  
从而使得第二个线程获取到当前值启动  
![image-20240331153335627][]  
![image-20240331153453773][]  
，在第二个线程启动完毕后让第二个变量设置增加一个当前值  
![image-20240331153519416][]  
从而使得第三个线程获取到secondJobDone的值启动  
![image-20240331153608768][]  
![image-20240331153621502][]

## 题目链接 ##

[1114. 按序打印 - 力扣（LeetCode）][1114. _ - _LeetCode]

*感谢各位读者的阅读，本文章有任何错误都可以在评论区发表你们的意见，我会对文章进行改正的。如果本文章对你有帮助请动一动你们敏捷的小手点一点赞，你的每一次鼓励都是作者创作的动力哦！😘*

[image-20240331151031321]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/ea873f32b62c44f69c92c33e30bc7099.png
[image-20240331151040787]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/608aa7bdd3af4abd82756575a2cd3056.png
[image-20240331151640859]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/0a5dbe2b667345ada06c580c3bd50fe1.png
[image-20240331151717246]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/2e98026656014767b9ef42fbb897f0a7.png
[image-20240331151540073]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/0aacd711119942129b84ceed5cf5d25b.png
[image-20240331152953013]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/e13699b681dd440f8cb72db2e93c3d83.png
[image-20240331153247113]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/536d776ad45445839d10ca9168ea98c1.png
[image-20240331153335627]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/0d3e1a5ea2044f0ba1ab7cb95da69b3d.png
[image-20240331153453773]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/082c08a5758c49fb826d4476fd04de00.png
[image-20240331153519416]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/5587edca9fbc45118b7017acebf256f3.png
[image-20240331153608768]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/56e6f810b3214c8e913191d1785509b8.png
[image-20240331153621502]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/28/55a32184e3054876960ec18f3fb2f56d.png
[1114. _ - _LeetCode]: https://leetcode.cn/problems/print-in-order/description/