实验二继承与接口实验

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1、实验二继承与接口—、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,av

2、erageWeight方法，BeijingPeople类重写其父类ChinaPeople类的speakHello,averageHeight,averageWeight方法。People类变量protecteddoubleheightprotecteddoubleweightChinaPeople类方法：publicvoidchinaGongfu()BeijingPeople类方法：PublicvoidbcijingOpcra()方法publicvoidspeakHello()publicvoidaverageHeight()publicvoi

3、davcragcWcight()AmericanPeople类方法：PublicvoidamcricanBoxing()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・printIn(+height);}publicv

4、oidaverageweight()//人们的平均体IE{weight=120;System・out・printIn(+weight);}}classChinapeopleextendspeople{publicvoidspeakHello(){System.out•printin(”你好“);}publicvoidaverageHeight(){height=172;System・out・printIn(+height);}publicvoidaverageweight(){weight=115;System・out・printIn(+wei

5、ght);}publicvoidchinaGongfu()//'

6、1国功夫的方法{System.out.printin("中国功夫,,);}}classAmericanpeopleextendspeople{publicvoidspeakHello(){System,out.printin(,,hello");}publicvoidaverageHeight()height=180;System.out.println(+height);}publicvoidaverageWeight()weight=150;System•out•printI

7、n(+weight);}publicvoidamericanBoxing()//^国拳击的方法System.out•println("americanBoxing");classBeijingpeopleextendsChinapeoplepublicvoidspeakHello()System.out.printIn(n北京欢迎你”);}publicvoidaverageHeight()height=168;System.out.println(+height);}publicvoidaverageWeight(){weight=125;Sy

8、stem•out.printIn(+weight);classExample{publicstaticvoidmain(String[]args)peoplep=newpeople();Chinapeoplec=newChinapeople();Americanpeoplea=newAmericanpeople();Beijingpeopleb=newBeijingpeople();p•averageHeight();p•averageWeight();р.speakHello();c•averageHeight();c•averageWeig

9、ht();с.chinaGongfu();c.speakHello();a•averageHeight();a•averageWeight();a•a