如何控制多线程的顺序执行

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于 2024-12-12 10:11:01 发布 · 1.1k 阅读

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文章标签：

#java #服务器 #linux

5 使用AQS的Condition(条件变量)

6 使用CountDownLatch

7 使用CyclicBarrier(回环栅栏)

8 使用Semaphore(信号量)

9 使用CompletableFuture

并发编程的重点：多线程之间的同步，依赖synchornized，wait & notify，AQS和基于Lock的各种实现。
9种方法实现多线程的顺序执行，定义thread1、thread2、thread3，要求执行顺序为：thread1 > thread2 > thread3

1 使用线程的join方法

线程依次join前序执行的线程；

    Thread thread1 = new Thread(
            () -> {
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("thread1 finished");
            }
    );
    Thread thread2 = new Thread(
            () -> {
                try {
                    thread1.join();
                    Thread.sleep(1000);
                    System.out.println("thread2 finished");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
    );
    Thread thread3 = new Thread(
            () -> {
                try {
                    thread2.join();
                    System.out.println("thread3 finished");
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
    );
    thread3.start();
    thread2.start();
    thread1.start();

2 使用主线程的join方法

        Thread thread1 = new Thread(
                () -> {
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("thread1 finished");
                }
        );
        Thread thread2 = new Thread(
                () -> {
                    try {
                        thread1.join();
                        Thread.sleep(1000);
                        System.out.println("thread2 finished");
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
        );
        Thread thread3 = new Thread(
                () -> {
                    try {
                        thread2.join();
                        System.out.println("thread3 finished");