实验二 继承与接口实验.doc

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1、实验二继承与接口一、实验目的1.掌握类的继承机制。2.熟悉类中成员变量和方法的访问控制。3.掌握接口与包的使用，熟悉方法的多态性。二、实验内容1.定义父类及子类，在子类中重写父类的方法2.练习接口与包的使用三、.实验步骤与要求第1题继承编写一个Java应用程序，除了主类外，该程序中还有4个类：People,ChinaPeople,AmericanPeople和BeijingPeople类。此四个类的继承关系如下图所示：要求ChinaPeople，American类均重写其父类People类的speakHello,averageHeight,averageWeig

2、ht方法，BeijingPeople类重写其父类ChinaPeople类的speakHello,averageHeight,averageWeight方法。People类变量方法protecteddoubleheightpublicvoidspeakHello()protecteddoubleweightpublicvoidaverageHeight()publicvoidaverageWeight()ChinaPeople类方法：publicvoidchinaGongfu()AmericanPeople类方法：PublicvoidamericanBoxing(

3、)BeijingPeople类方法：PublicvoidbeijingOpera()源代码：packagepeople;classpeople{protecteddoubleheight;protecteddoubleweight;publicvoidspeakHello()//问候语的函数{System.out.println("hello");}publicvoidaverageHeight()//人们的平均身高{height=170;System.out.println(+height);}publicvoidaverageWeight()//人们的平均体

4、重{weight=120;System.out.println(+weight);}}classChinapeopleextendspeople{publicvoidspeakHello(){System.out.println("你好");}publicvoidaverageHeight(){height=172;System.out.println(+height);}publicvoidaverageWeight(){weight=115;System.out.println(+weight);}publicvoidchinaGongfu()//中国功夫的

5、方法{System.out.println("中国功夫");}}classAmericanpeopleextendspeople{publicvoidspeakHello(){System.out.println("hello");}publicvoidaverageHeight(){height=180;System.out.println(+height);}publicvoidaverageWeight(){weight=150;System.out.println(+weight);}publicvoidamericanBoxing()//美国拳击的方法

6、{System.out.println("americanBoxing");}}classBeijingpeopleextendsChinapeople{publicvoidspeakHello(){System.out.println("北京欢迎你");}publicvoidaverageHeight(){height=168;System.out.println(+height);}publicvoidaverageWeight(){weight=125;System.out.println(+weight);}}classExample{publicsta

7、ticvoidmain(String[]args){peoplep=newpeople();Chinapeoplec=newChinapeople();Americanpeoplea=newAmericanpeople();Beijingpeopleb=newBeijingpeople();p.averageHeight();p.averageWeight();p.speakHello();c.averageHeight();c.averageWeight();c.chinaGongfu();c.speakHello();a.averageHeight();a.

8、averageWeigh