介紹

方法1

通過join方法去保證多執行緒順序執行
join：讓主執行緒等待子結束以後才能繼續執行

方法2

ExecutorService executorService = Executors.newSingleThreadExecutor();

FIFO佇列

程式碼

public class Test {

    static Thread thread1 = new Thread(new Runnable() {
        @Override
        public void run() {
            System.
 
out.println("thread1");
        }
    });

    static Thread thread2 = new Thread(new Runnable() {
        @Override
        public void run() {
            System.out.println("thread2");
        }
    });

    static Thread thread3 = new Thread(new Runnable() {
        @Override
        public void
 
 run() {
            System.out.println("thread3");
        }
    });

    static ExecutorService executorService = Executors.newSingleThreadExecutor();

    public static void main(String[] args) throws InterruptedException {

        // thread1
        // thread2
        // thread3
        method1();

        // thread1
 

        // thread2
        // thread3
        method2();

    }

    private static void method2() throws InterruptedException {
        thread1.start();
        thread1.join();
        thread2.start();
        thread2.join();
        thread3.start();
    }

    private static void method1() {
        executorService.submit(thread1);
        executorService.submit(thread2);
        executorService.submit(thread3);
    }

}

參考部落格