java 多线程，T1 T2 T3 顺序执行

一、程序设计

1.抽象公共类PublicThread，具有先前线程属性previousThread、父类为Thread

2.在PublicThread的run()方法中判断previousThread属性是否为null,如果不为null,执行previousThread的join()方法

3.定义PublicThread的构造方法：1个空参 1个以previousThread为构造参数

3.创建测试类ThreadOrder，创建三个PublicThread对象，进行测试

二、代码实现

PublicThread

package org.zheng.thread;

public class PublicThread extends Thread{
    private Thread previousThread = null;

    public PublicThread() {
        super();
    }

    public PublicThread(Thread previousThread) {
        super();
        this.previousThread = previousThread;
    }
    @Override
    public void run() {
        if(previousThread!=null){
            try {
                previousThread.join();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        System.out.println(Thread.currentThread().getName());
    }
}

测试类ThreadTest

package org.zheng.thread;

public class ThreadTest {

    public static void main(String[] args) {
        Thread t1 = new PublicThread();
        t1.setName("T1");
        Thread t2 =  new PublicThread(t1);
        t2.setName("T2");
        Thread t3 = new PublicThread(t2);
        t3.setName("T3");

        t1.start();
        t2.start();
        t3.start();
    }

}