上转型对象多态示例java源程序

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1、Person.java源程序清单publicclassPerson{privateStringname;privateintage;publicPerson(){name="";age=0;}publicPerson(Stringname,intage){this.name=name;if(age<0){age=0;}this.age=age;}publicvoidsetName(Stringname){this.name=name;}publicStringgetName(){returnname;}publicvoidsetAge(intage){if(a

2、ge<0){age=0;}this.age=age;}publicintgetAge(){returnage;}publicvoiddisplay(){System.out.println("姓名:"+name+"t年龄："+age);}}Student.java源程序清单publicclassStudentextendsPerson{privateStringschoolName;Student(){schoolName="";}Student(Stringname,intage,StringschoolName){super(name,age);this

3、.schoolName=schoolName;}publicvoidsetSchoolName(StringschoolName){this.schoolName=schoolName;}publicStringgetSchoolName(){returnschoolName;}publicvoiddisplay(){super.display();System.out.println("学校名称："+schoolName);}}Worker.java源程序清单publicclassWorkerextendsPerson{privateLongyield;pu

4、blicWorker(){yield=newLong(0);}publicWorker(Stringname,intage,Longyield){super(name,age);this.yield=yield;}publicvoidsetYield(Longyield){this.yield=yield;}publicLonggetYield(){returnyield;}publicvoiddisplay(){super.display();System.out.println("产量："+yield.longValue());}}Viewer.java源

5、程序清单publicclassViewer{publicvoidview(Personp){p.display();}}Test.java源程序清单publicclassTest//含有main()方法的主类{publicstaticvoidmain(String[]args){Students=newStudent("张三",24,"我的ＪＡＶＡ学堂");//定义Student类变量并实例化Workerw=newWorker("Jone",40,newLong(1005));//定义Worker类变量并实例化Viewerv=newViewer();v.vie

6、w(s);//调用Student对象的实例方法v.view(w);//调用Worker对象的实例方法}}