JAVA如何让多个线程顺序执行？

╰+哭是因爲堅強的太久メ 2022-12-13 11:24 183阅读 0赞

直接代码说明

/**
     * 顺序执行多线程
     * @author GaoYuan
     */
    public class SortThread {
        
    
        public static void main(String[] args) throws Exception{
        
            /**
             * 方法一
             * 利用newSingleThreadExecutor()
             */
            Thread thread1 = new Thread(() -> System.out.println("run thread1"),"thread1");
            Thread thread2 = new Thread(() -> System.out.println("run thread2"),"thread2");
            Thread thread3 = new Thread(() -> System.out.println("run thread3"),"thread3");
            ExecutorService executor = Executors.newSingleThreadExecutor();
            executor.execute(thread1);
            executor.execute(thread2);
            executor.execute(thread3);
            // 记得关闭 - 有兴趣可以看看 shutdown 与 shutdownNow 的区别
            executor.shutdown();
    
            Thread.sleep(1000);
    
            /**
             * 方法二
             * 利用thread.join 主程序中调用join
             */
            thread1.start();
            try{
         thread1.join();}catch (InterruptedException e){
        }
            thread2.start();
            try{
         thread2.join();}catch (InterruptedException e){
        }
            thread3.start();
    
            Thread.sleep(1000);
    
            /**
             * 方法三
             * 利用thread.join 每个独立的线程中调用
             */
            Thread thread4 = new Thread(() -> {
        
                System.out.println("run thread4");
                // 这里延时是为了验证thread5是否在等待thread4运行结束
                try {
         Thread.sleep(500); }catch (Exception e){
        }
            },"thread4");
            Thread thread5 = new Thread(() -> {
        
                try {
        
                    // 等线程 thread4 调用结束后继续
                    thread4.join();
                }catch (InterruptedException e){
        }
                System.out.println("run thread5");
            },"thread5");
            Thread thread6 = new Thread(() -> {
        
                try {
        
                    thread5.join();
                }catch (InterruptedException e){
        }
                System.out.println("run thread6");
            },"thread6");
    
            thread4.start();
            thread5.start();
            thread6.start();
        }   
    }