接口之二

/* File name : Animal.java */interface Animal {   public void eat();   public void travel();}

/* File name : MammalInt.java */public class MammalInt implements Animal{   public void eat(){      System.out.println("Mammal eats");   }   public void travel(){      System.out.println("Mammal travels");   }    public int noOfLegs(){      return 0;   }   public static void main(String args[]){      MammalInt m = new MammalInt();      m.eat();      m.travel();   }} 

原文：http://www.tutorialspoint.com/java/java_interfaces.htm