d5_inheritance

public class People {
    private String name;
    private Integer age;
    public void eat(){
        System.out.println("吃饭");
    }
    public void sleep(){
        System.out.println("睡觉");
    }
}

public class Student extends People{
    private String studentNo;
    public void study(){
        System.out.println("学生学习");
    }
}

public class Teacher extends People{
    private String teacherCode;
    public void teach(){
        System.out.println("上课");
    }
}