Java程序设计-试验3(学生版).doc

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1、华北电力大学实验报告实验名称Java程序面向对象设计（二）课程名称Java程序设计专业班级：学生姓名：学号：成绩：指导教师：张学斌实验日期：华北电力大学实验报告一、实验目的及要求1.掌握类的继承。2.掌握类的隐藏和覆盖。3.掌握抽象类和抽象方法二、试验内容实验1中国人、北京人和美国人1．实验要求编写程序模拟中国人、美国人是人，北京人是人。出主类外，程序中还有4个类：People、ChinaPeople、AmericanPeople和BeijingPeople。要求如下：lPeople类有权限是protected的double型成员变量height和weight,以及

2、publicvoidspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。lChinaPeople类是People类的子类，新增了publicvoidchinaGongfu()方法，要求Chinapeople重写父类的publicvoidspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。lAmericanPeople类是People的子类，新增publicvoidamericanBoxing()方法。要求

3、Americanpeople重写父类的publicvoidspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。lBeijingPeople类是Chinapeople的子类，新增publicvoidbeijingOpera()方法。要求ChinaPeople重写父类的publicvoidspeakHello()、publicvoidaverageHeight()和publicvoidaverageWeight()方法。2．程序模板People.javapublicclassPeople{

4、protecteddoubleweight,height;publicvoidspeakHello(){System.out.println("yayayaya");}publicvoidaverageHeight(){height=173;System.out.println("averageheight:"+height);}publicvoidaverageWeight(){weight=70;System.out.println("averageweight:"+weight);}}--------------------------------------

5、----------------------------------------------ChinaPeople.javapublicclassChinaPeopleextendsPeople{publicvoidspeakHello(){System.out.println("您好");第页共页华北电力大学实验报告}publicvoidaverageHeight(){height=168.78;System.out.println("中国人的平均身高:"+height+"厘米");}【代码1】//重写publicvoidaverageWeight()方法，输出:

6、"中国人的平均体重：65公斤"publicvoidchinaGongfu(){System.out.println("坐如钟,站如松,睡如弓");}}------------------------------------------------------------------------------------------------------AmericanPeople.javapublicclassAmericanPeopleextendsPeople{【代码2】//重写publicvoidspeakHello()方法，输出"Howdoyoudo"【代码

7、3】//重写publicvoidaverageHeight()方法，输出"American'saverageheight:176cm"publicvoidaverageWeight(){weight=75;System.out.println("American'saverageweight:"+weight+"kg");}publicvoidamericanBoxing(){System.out.println("直拳、钩拳、组合拳");}}------------------------------------------------------------