student1和student2 和teacher 类，多线程问题

参照例15.7，编写一个Java应用程序，要求有student1、student2和teacher 3个线程，其中，student1准备睡10分钟后再开始上课，student2准备睡1小时后再开始上课。teacher在输出3句“上课”后吵醒休眠的线程student1； student1被吵醒后，负责吵醒休眠的线程student2。

public class teacher {

    public static void main(String[] args){

        Student1 stu1=new Student1();
        Student2 stu2=new Student2();
        Thread thread2=new Thread(stu2);
        Thread thread1=new Thread(stu1);
        stu1.setThread(thread2);

        thread1.start();
        thread2.start();

        System.out.println("上课");
    }
}

public class Student1 implements Runnable{
    Thread student2;

    @Override
    public void run() {
        try {
            Thread.sleep(1000*3);
            student2.interrupt();
            System.out.println("1结束");

        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }


    }

    public void setThread(Thread student2){
        this.student2=student2;
    }



}

public class Student2 implements Runnable{

    @Override
    public void run() {
        try {
            Thread.sleep(6000);

        } catch (InterruptedException e) {
            System.out.println("2结束");
        }
    }
}