?????????????????
???????????? ???????[ 2013/1/18 10:42:37 ] ????????
??????????????????????????校?dog?????????Animal??????????????????????Sound????????????????”???“????????”???“?????????????????dog???????????Dog??写????????
??????”?????/????????"???????锟�?
class Animal {
String name;
String sex;
public void Display()
{
System.out.println("name =" + name + "sex =" + sex);
}
public void Sound()
{
System.out.println("make sound!");
}
}
class Dog extends Animal{
public void Sound()
{
System.out.println("wang...wang...wang...");
}
}
class Cat extends Animal{
public void Sound()
{
System.out.println("miao...miao...miao...");
}
}
public class AnimalTest {
public static void main(String[] args)
{
Animal animal = new Dog();
animal.Sound();
animal = new Cat();
animal.Sound();
}
}
??????????????校?Animal animal = new Dog???????????????????Animal??????????????????Dog????????????Dog?????????????Animal??????Animal?????????????????Dog??????????
?????????????校????????????????animal???????????????????????????械??????????????????????????????????????????????????????“?????????????????????”???????????????????“???”?????????宀�??????????“???????”??????????????????????“???”??????????“?????????????“????????
??????????
??????1????????????
????1????? ?? ???????????????????????????????????
????2?????? ?? ??懈??????????????????????????????????.
??????2??????????????????????????????????????????????????谩?
??????3??java ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????卸?????????????????????????
????1?????a????A???????????????a?????????A????????????????????A?????????
????2?????a????A???????????????a??????????????A?????????????
??????

???路???
??????????????????
2023/3/23 14:23:39???写?貌??????????
2023/3/22 16:17:39????????????????????些??
2022/6/14 16:14:27??????????????????????????
2021/10/18 15:37:44???????????????
2021/9/17 15:19:29???路???????路
2021/9/14 15:42:25?????????????
2021/5/28 17:25:47??????APP??????????
2021/5/8 17:01:11