用Telphone iphone = new Iphone();和Iphone iphone = new Iphone();具體區(qū)別？
public class Text {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Telphone iphone = new Iphone();
iphone.call();
iphone.messge();
Callphone callphone = new Callphone();
callphone.call();
callphone.messge();
}
}
2016-02-21
Telphone iphone=new Iphone();屬于多態(tài)性中的向下轉(zhuǎn)型
子類 子類對(duì)象=父類實(shí)例
補(bǔ)充：向上轉(zhuǎn)型 ?父類 父類對(duì)象=子類實(shí)例
Iphone iphone=new Iphone();
這個(gè)就是正常情況通過類名創(chuàng)建對(duì)象并實(shí)例化