/////////////這是一個函數重載/上轉型對象的例子
class  Animal
{  
   void cry() 
    {
    }
}
class Dog extends Animal 
{  void cry() 
    {  
      System.out.println("Wang!Wang!......"); 
    }  
}
class Cat extends Animal 
{ 
    void cry() 
    {  
      System.out.println("miao~~miao~~....."); 
    }  
}
class Example 
{  public static void main(String args[]) 
    {  
        Animal animal;
        animal=new Dog();
        animal.cry(); 
        animal=new Cat();
        animal.cry(); 
    }
}