C-6 南北方饮食文化不同的案例

/*
    不同地方饮食文化不同案例
*/
class Person{
    public void eat(){
        System.out.println("吃饭");
    }
}

class SouthPerson extends Person {
    public void eat(){
        System.out.println("吃米饭");
    }
    public void sell(){
        System.out.println("经商");
    }
}

class NorthPerson extends Person {
    public void eat(){
        System.out.println("吃馒头");
    }
    public void study(){
        System.out.println("研究");
    }
}

class DuoTaiTest{
    public static void main(String[] args){
        Person p = new SouthPerson();
        p.eat();
        System.out.println("----------");
        
        SouthPerson sp = (SouthPerson) p;
        sp.eat();
        sp.sell();
        System.out.println("----------");
        
        p = new NorthPerson();
        p.eat();
        System.out.println("----------");
        
        NorthPerson np = (NorthPerson) p;
        np.eat();
        np.study();
    }

}

运行结果：

吃米饭
----------
吃米饭
经商
----------
吃馒头
----------
吃馒头
研究