14401048方萍3班实验4

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1、Java程序设计实验四：继承、多态与接口2015-2016学年第一学期Java程序设计实验四：继承、多态与接口1.提交期限和方法期限：第12周周五（2015-11-27）23：59pm方法：由学习委员收集所有学生的实验报告，以电子档的形式提交给任课教师（发邮箱：9867941@qq.com）。2.实验目的及要求掌握Java的基本数据类型、运算符、表达式和语句。运行环境：JDK1.7开发环境：Eclipse3.实验内容及题目3.1子类的继承与方法的重写【题1中国人与美国人】在Eclipse中创建名为Lab4的新项目，编写程序模拟中国人、美国人、北京人。除主类外，程序中有4个类：

2、People、ChinaPeople、AmericanPeople和BeijingPeople类。要求如下：（1）People类有权限是protected的double型成员变量：height和weight，以及publicvoidspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。（2）ChinaPeople类是People类的子类，新增了publicvoidchinaGongfu()方法。要求ChinaPeople重写父类的publicvoidspeakHello()、publicvoida

3、verageHeight()和publicvoidaverageWeight()方法。（3）AmericanPeople类是People的子类，新增publicvoidamericanBoxing()方法。要求AmericanPeople重写父类的publicvoidspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。（4）BeijingPeople类是ChinaPeople的子类，新增publicvoidbeijingOpera()方法。要求BeijingPeople重写父类的publicvo

4、idspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。运行效果如下图。按下列代码模板要求，将【代码】部分替换为Java程序代码。第13页共13页Java程序设计实验四：继承、多态与接口2015-2016学年第一学期部分代码已给出：//People.javapublicclassPeople{protecteddoubleweight,height;publicvoidspeakHello(){System.out.println("yayayaya");}publicvoidaverageHe

5、ight(){height=173;System.out.println("averageheight:"+height);}publicvoidaverageWeight(){weight=70;System.out.println("averageweight:"+weight);}}//ChinaPeople.javapublicclassChinaPeopleextendsPeople{publicvoidspeakHello(){System.out.println("您好");}publicvoidaverageHeight(){height=168.78;Sys

6、tem.out.println("中国人平均身高:"+height+"厘米");}//重写publicvoidaverageWeight()方法，输出："中国人平均体重:65公斤"//【代码1】publicvoidchinaGongfu(){System.out.println("坐如钟，站如松，睡如弓");}}//AmericanPeople.javapublicclassAmericanPeopleextendsPeople{//重写publicvoidspeakHello()方法，输出"Howdoyoudo"//【代码2】//重写publicvoidaverageHei

7、ght()方法，输出"American'saverageheight:176cm"第13页共13页Java程序设计实验四：继承、多态与接口2015-2016学年第一学期//【代码3】publicvoidaverageWeight(){weight=75;System.out.println("American'saverageweight:"+weight+"kg");}publicvoidamericanBoxing(){System.out.println("直拳、勾拳、组合拳");}}//Beij