package com.ljh;??? abstract class phone {?? ?public abstract void call();?? ?public abstract void send();}public abstract class iphone extends phone{?? ?public void call(){?? ??? ?System.out.println("通過鍵盤打電話");?? ?}?? ?public void send(){?? ??? ?System.out.println("通過鍵盤發短信");?? ?}?? ?public abstract class zniphone extends phone{?? ??? ?public void call(){?? ??? ??? ?System.out.println("通過語音打電話");?? ??? ?}?? ??? ?public void send(){?? ??? ??? ?System.out.println("通過語音發短信");?? ??? ?}?? ??? ??? ?}?? ?public static void main(String[] args) {?? ??? ?phone a = new iphone();?? ??? ?a.call();?? ??? ??? ??? ??? ??? ??? ?}?? ?}