用JAVA写出下面程序，要求：有3个线程，即 studentl、student2 和 teacher。其中 studentl 准备睡10分钟后再开始上课；student2 淮备睡1小时后再开始上课;teacher 在输出 了句“上课！”后砂醒休眠的线程 studentI,studentI 被吵醒后再负 责吵醒休眠的线程 student2。

好的，以下是使用Java实现的代码：

public class Main {
    public static void main(String[] args) {
        Student student1 = new Student("Student1", 10);
        Student student2 = new Student("Student2", 60);
        Teacher teacher = new Teacher("Teacher", student1, student2);
        teacher.start();
    }
}

class Student extends Thread {
    private int sleepTime;

    public Student(String name, int sleepTime) {
        super(name);
        this.sleepTime = sleepTime;
    }

    public void run() {
        System.out.println(getName() + " is sleeping for " + sleepTime + " minutes");
        try {
            Thread.sleep(sleepTime * 60 * 1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(getName() + " is awake now!");
    }
}

class Teacher extends Thread {
    private Student student1;
    private Student student2;

    public Teacher(String name, Student student1, Student student2) {
        super(name);
        this.student1 = student1;
        this.student2 = student2;
    }

    public void run() {
        System.out.println(getName() + " says: Class is starting!");
        student1.start();
        try {
            student1.join();
            System.out.println(getName() + " wakes up " + student2.getName());
            student2.interrupt();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println(getName() + " says: Class is over!");
    }
}

在这个实现中，我们同样创建了一个`Teacher`线程和两个`Student`线程。与Python实现不同的是，Java中需要继承`Thread`类并重写`run()`方法来创建线程。`Teacher`线程启动`Student1`线程后，调用`join()`方法等待它结束，然后输出一句话并通过`interrupt()`方法中断`Student2`线程的睡眠，让它醒来。注意到在`Student1`的`run()`方法中，我们使用了`Thread.sleep()`方法来让线程睡眠一定的时间，在`Teacher`线程中我们中断了`Student2`线程的睡眠，这都有可能抛出`InterruptedException`异常，因此需要在合适的位置进行异常处理。