dog.java

利用多态性编程

 package seck;
 public class dog  
 {
      public boolean isAMammal()
      {
          return(true);
        }
       public boolean isCarnivorous()
       {
          return(true);
        }                                                 
     public String getHello() 
      {
          return("Bark");
      }
     
}