上机实践4继承与接口.doc

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1、上机实践4继承与接口实验1继承Example.javaclassPeople{protecteddoubleweight,height;publicvoidspeakHello(){System.out.println("yayawawa");}publicvoidaverageHeight(){height=173;System.out.println("averageheight:"+height);}publicvoidaverageWeight(){weight=70;System.out.println("averagew

2、eight:"+weight);}}classChinaPeopleextendsPeople{【代码1】//重写publicvoidspeakHello()方法，要求输出类似“你好，吃了吗”这样的//汉语信息【代码2】//重写publicvoidaverageHeight()方法，要求输出类似//“中国人的平均身高：168.78厘米”这样的汉语信息【代码3】//重写publicvoidaverageWeight()方法，//要求输出类似“中国人的平均体重：65公斤”这样的汉语信息publicvoidchinaGongfu(){【代

3、码4】//输出中国武术的信息，例如："坐如钟,站如松,睡如弓"等}}classAmericanPeopleextendsPeople{【代码5】//重写publicvoidspeakHello()方法，要求输出类似//“Howdoyoudo”这样的英语信息。【代码6】//重写publicvoidaverageHeight()方法【代码7】//重写publicvoidaverageWeight()方法publicvoidamericanBoxing(){【代码8】//输出拳击的信息，例如，“直拳”、“钩拳”等}}classBeijin

4、gPeopleextendsChinaPeople{【代码9】//重写publicvoidspeakHello()方法，要求输出类似“您好”这样的汉语信息【代码10】//重写publicvoidaverageHeight()方法【代码11】//重写publicvoidaverageWeight()方法publicvoidbeijingOpera(){【代码12】//输出京剧的信息}}publicclassExample{publicstaticvoidmain(Stringargs[]){ChinaPeoplechinaPeople

5、=newChinaPeople();AmericanPeopleamericanPeople=newAmericanPeople();BeijingPeoplebeijingPeople=newBeijingPeople();chinaPeople.speakHello();americanPeople.speakHello();beijingPeople.speakHello();chinaPeople.averageHeight();americanPeople.averageHeight();beijingPeople.ave

6、rageHeight();chinaPeople.averageWeight();americanPeople.averageWeight();beijingPeople.averageWeight();chinaPeople.chinaGongfu();americanPeople.americanBoxing();beijingPeople.beijingOpera();beijingPeople.chinaGongfu();}}实验2上转型对象HardWork.javaabstractclassEmployee{publica

7、bstractdoubleearnings();}classYearWorkerextendsEmployee{【代码1】//重写earnings()方法}classMonthWorkerextendsEmployee{【代码2】//重写earnings()方法。}classWeekWorkerextendsEmployee{【代码3】//重写earnings()方法。}classCompany{Employee[]employee;doublesalaries=0;Company(Employee[]employee){this.

8、employee=employee;}publicdoublesalariesPay(){salaries=0;【代码4】//计算salaries。returnsalaries;}}publicclassHardWork{public