9、Java面向对象之继承和多态作业题

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1、Java面向对象之继承和多态作业题2011/9/23•上机要求：使用Eclipse编写主题类、回复类要求如下：■主题类继承帖子类,并增加属性：主题id,版块id9回复类继承帖子类，并增加属性：回复id,主题id9在帖子类中实现多态-使用super调用父类构造方法•阶段一：■需求说明：■创建主题类，继承帖子类类名Topic属性topield：intboardld：int类名Tip属性title：Stringcontent：StringpublishTime：Stringuid：int方法getlnfoO:void⑨实现思路及关V

2、：代码:1、创建主题类：Topic,继承帖子类：Tip2、增加以下属性主题id：inttopield版块id：intboardld3、添加setter/getter方法4、使用从帖子类继承来的getlnfoO方法，输岀主题信息packagecom.workit•part3;publicclassTopic{privateinttopield;privateintboardTd;publicTopic(inttopield,intboardTd){super();this.topield=topield;this.boardTd

3、=boardTd;packagecom.workit・p3rt3;publicclassTipextendsTopic{publicTip(inttopicld,intboardTd){super(topicld,boardTd);//TODOAuto-generatedconstructorstub}privateStringtitle;privateStringcontent;privateStringpublishTime;publicStringgetTitle(){returntitle;}publicvoidset

4、Title(Stringtitle){this.tit*=title;}publicStringgetContent(){returncontent;}publicvoidsetContent(Stringcontent){this.content=content;}publicStringgetPublishTime(){returnpublishTime;}publicvoidsetPublishTime(StringpublishTime){this•publishTime=publishTime;}publicvoid

5、title(){System・out・printin("巾占子标题：t”);}publicvoidcontent(){System.out.printIn("巾占子内容：t”);}publicvoidpublishTime(){System,out.printin("发帖时间:t,f);•阶段二：⑨需求说明：1、创建回复类：Reply,继承帖子类：Tip2、增加以下属性回复id：intreplyld主题id：inttopicld3、添加setter/getter方法4、使用从帖子类继承来的getlnfo()方法，输出回复

6、信息packagecom.workit.part3;publicclassReply{privateinttopicld;privateintboardld;privateintreplyld;publicintsetTopicId(inttopicld){returntopicld;}publicvoidgetTopicId(){this.topicld=topicld;}publicintsetBoardld(intboardld){returnboardld;}publicvoidgetBoardld(){this.bo

7、ardld=boardld;}publicintsetReplyld(intreplyld){returnreplyld;}publicvoidgetReply(){this.replyld=replyld;}}packagecom.workit.part3;publicclassTip2extendsReply{privateSt:ringtitle;privateStringcontent;privateStringpublishTime;publicStringsetTitle(Stringtitle){returnti

8、tle;}publicvoidgetTitle(){this.title=title;}publicStringsetContent(Stringcontent){returntitle;}publicvoidgetContent(){七his.content=content