1.创建老师类和学生类，两个类都实现了问候接口和工作接口，模拟上课的场景，运行效果如下：

package Zaria;
interface hello{public void speak();
}
interface work{public void dowork();
}
class Student implements hello,work{public void speak(){System.out.println("peter:老师好");}public void dowork(){System.out.println("peter:同学开始记笔记");}
}
class Teacher implements hello,work{public void speak(){System.out.println("mike:同学们好");}public void dowork(){System.out.println("mike:老师开始上课");}}public class MoniShangKe{public static void main(String[] args){Student s=new Student();Teacher t=new Teacher();s.speak();t.speak();t.dowork();s.dowork();}
}