4.多线程按序打印

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

题目解答

AtomicInteger原子类方法展示：

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();
  }
}

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
从而使得第二个线程获取到当前值启动


，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

从而使得第三个线程获取到secondJobDone的值启动

题目链接

1114. 按序打印 - 力扣（LeetCode）

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