如下有关问题，解题，看大家怎么解，修改

如下问题，解题，看大家如何解，修改。
大家提供自己的参考下，看看大家如何修改的。 

根据提供的主程序修改程序，定义不同的行为类。 主程序中Say and Sing 不是String。

比如 say 和 sing 各定义为类。看看大家发挥，
根据这个主程序：谢谢

Java code

.....    Person father = new Father();        father.setContent("How are you");        father.act(sing);        Mother mother = new Mother();        mother.act(say);....

修改如下程序：

Java code

public class PloyTest1{        public  void say(Person person)    {       person.say();    }     public  void sing(Person person)    {       person.sing();    }     public static void main(String[] args)    {       PloyTest1 test = new PloyTest1();        Person person = new Father();       // test.say(person);       test.sing(person);        Mother mother = new Mother();       test.say(mother);     } }  //class Person abstract class Person{    /*public void say()    {       System.out.println("person is saying");    }*/     /*public void sing()    {       // TODO Auto-generated method stub       System.out.println("");    }*/        public abstract void say();        public void sing(){}} class Father extends Person{    public void say()    {       System.out.println("father is saying: How are you?");    }     @Override    public void sing()    {       // TODO Auto-generated method stub       System.out.println("father sing: how are you");    }} class Mother extends Person{    public void say()    {       System.out.println("mother is saying: I am fine");    }     /*@Override    public void sing()    {       // TODO Auto-generated method stub           }*/}

[解决办法]
主程序有问题，就算sing和say是类，也不可能直接用类当参数，要么是sing.class之类的，要么就是new一个sing对象再当参数传入
如果sing和say是对象，比如这段主程序之前定义 Sing sing = new Sing()之类的，那么很显然，act方法接收的参数就是sing和say的共同父类或超类或接口

所以
可以采用接口

Java code

interface IMouthAction {    void action();}class Sing implement IMouthAction {    public void action() {System.out.println("sing");}}class Say implement IMouthAction {    public void action() {System.out.println("say");}}abstract class Person {    public void act(IMouthAction action) {action.action();}}class Father extends Person {}class Mather extends Person {}public class Main {    public static void main(String[] args) {        IMouthAction sing = new Sing();        IMouthAction say = new Say();        ... //LZ的主代码部分    }} 

 

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