教师要认真授课

class People {
public void work() {
System.out.println("每个人都要工作");
}
}

class Teacher extends People {
@Override
public void work() {
System.out.println("教师要认真授课");
}
}

class Student extends People {
@Override
public void work() {
System.out.println("学生要好好学习");
}
}

public class Demo {
public static void main(String[] args) {
People people = new People();
people.work();
People teacher = new Teacher();
teacher.work();
People student = new Student();
student.work();
}
}