java上机实验-类

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1、Java上机31掌握类的继承并应用，要求：（1）定义一个People类,该类具有类型为double,访问权限是protected的成员变量：height和weight；以及方法：publicvoidspeakHello(),publicvoidaverageHeight()和publicvoidaverageWeight()。（2）定义一个ChinaPeople类,,它是People的子类，新增了publicvoidchinaGongfu()方法,并要求ChinaPeople类重写父类的publicvoidspeakHello(

2、),publicvoidaverageHeight()和publicvoidaverageWeight()方法。（3）定义一个BeijingPeople类,,它是ChinaPeople的子类，新增了publicvoidbeijingOpera()方法,并要求BeijingPeople类重写父类的publicvoidspeakHello(),publicvoidaverageHeight()和publicvoidaverageWeight()方法。（4）定义一个主类，在主类中用上述类生成对象以及使用对象。classPeople{p

3、rotecteddoubleheight;protecteddoubleweight;publicvoidspeakHello(){System.out.println("Hello,我是people类！");}publicvoidaverageHeight(){height=165;System.out.println("people平均身高为"+height+"厘米");}publicvoidaverageWeight(){weight=150;System.out.println("people平均体重为"+weight+

4、"斤");}}classChinaPeopleextendsPeople{publicvoidchinaGongfu(){System.out.println("Ilikechinesegongfu!");}publicvoidspeakHello(){System.out.println("Hello,我是ChinaPeople类！");}publicvoidaverageHeight(){height=175;System.out.println("ChinaPeople平均身高为"+height+"厘米");}public

5、voidaverageWeight(){weight=145;System.out.println("ChinaPeople平均体重为"+weight+"斤");}}classBeijingPeopleextendsChinaPeople{publicvoidbeijingOpera(){System.out.println("我会唱京剧!");}publicvoidspeakHello(){System.out.println("Hello,我是BeijingPeople类！");}publicvoidaverageHeigh

6、t(){height=168;System.out.println("BeijingPeople平均身高为"+height+"厘米");}publicvoidaverageWeight(){weight=148;System.out.println("BeijingPeople平均体重为"+weight+"斤");}}publicclassE31{publicstaticvoidmain(Stringargs[]){Peoplepeople=newPeople();ChinaPeoplechinapeople=newChinaP

7、eople();BeijingPeoplebeijingpeople=newBeijingPeople();people.speakHello();people.averageHeight();people.averageWeight();chinapeople.chinaGongfu();chinapeople.speakHello();chinapeople.averageHeight();chinapeople.averageWeight();beijingpeople.chinaGongfu();beijingpeopl

8、e.beijingOpera();beijingpeople.speakHello();beijingpeople.averageHeight();beijingpeople.averageWeight();}}2掌握抽象类的应用，要求：定义抽象类Shape，有