Java专题十三（6）：线程顺序执行（join的用法）

Java专题十三（6）：线程顺序执行(join、newSingleThreadExecutor）

join方法

join是java.lang.Thread中的一个方法，用于线程串行执行

在B线程中调用了A线程的join()方法时，表示只有当A线程执行完毕时，B线程才能继续执行。

        public class ThreadA extends Thread{
	public void run(){
		System.out.println("currentThread => ThreadA");
	}
}
public class ThreadB extends Thread{
	Thread previous;
	
	public ThreadB(Thread t){
		previous = t;
	}
	public void run(){
		if (null != previous){
			previous.join();
		}
		System.out.println("currentThread => ThreadB");
	}
}

public class ThreadTest{
   public static void main(String[] args) {
        Thread threadA = new ThreadA();
        Thread threadB = new ThreadB(threadA);
        threadA.start();
        threadB.start();
   }
}

    

输出结果:

        currentThread => ThreadA
currentThread => ThreadB

    

newSingleThreadExecutor方法

使用单线程线程池，提交到线程池的线程任务会被顺序执行

        public class ThreadA extends Thread{
	public void run(){
		System.out.println("currentThread => ThreadA");
	}
}
public class ThreadB extends Thread{
	public void run(){
		System.out.println("currentThread => ThreadB");
	}
}

public class ThreadTest{
   public static void main(String[] args) {
        Thread threadA = new ThreadA();
        Thread threadB = new ThreadB();
        ExecutorService executor = Executors.newSingleThreadExecutor();
        executor.execute(threadA);
        executor.execute(threadB);
   }
}

    

输出结果:

        currentThread => ThreadA
currentThread => ThreadB

    

原文：https://www.cnblogs.com/myibu/p/12925018.html