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    ³éÏóÀàÖв»Ò»¶¨°üº¬³éÏó·½·¨£¬µ«Êǰüº¬³éÏó·½·¨µÄÀàÒ»¶¨Òª±»ÉùÃ÷Ϊ³éÏóÀà¡£³éÏóÀà±¾Éí²»¾ß±¸Êµ¼ÊµÄ¹¦ÄÜ£¬Ö»ÄÜÓÃÓÚÅÉÉúÆä×ÓÀà¡£³éÏóÀàÖпÉÒÔ°üº¬¹¹Ôì·½·¨£¬µ«Êǹ¹Ôì·½·¨²»Äܱ»ÉùÃ÷Ϊ³éÏó¡£
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abstract class Animal    //¶¨Òå³éÏóÀà
{
    String str;
    Animal(String s)     //¶¨Òå³éÏóÀàµÄÒ»°ã·½·¨
   {
        str=s;
   }
    abstract void eat();      //¶¨Òå³éÏó·½·¨
}
class Horse extends Animal     //¶¨Òå¼Ì³ÐAnimalµÄ×ÓÀà
{  
    String str;
    Horse(String s)
   {
      super(s);      //µ÷Óø¸ÀàµÄ¹¹Ôì·½·¨
   }
    void eat()      //ÖØÐ´¸¸ÀàµÄ³éÏó·½·¨
   {     
      System.out.println("Âí³Ô²ÝÁÏ£¡");
   }
}
class Dog extends Animal
{
    String str;
    Dog(String s)
   {
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