extenddemo.java

该系统使用极其简便

public class ExtendDemo {
       public static void main(String[] args) {
              Chicken chicken1=new Chicken("xiaoke","hongsexiaojiguang");
                Chicken chicken2=new Chicken();
              System.out.printf("xiaoji1 - mingcheng %s, jiguangshi %s. \n",chicken1.getName(),
                                  chicken1.getCrest());
                chicken1.wu();
               System.out.printf("xiaoji2 - mingcheng %s, jiguangshi %s. \n",chicken2.getName(),
                                  chicken2.getCrest());
                  chicken2.wu();
        }
}