實驗報告三課程JAVA語言程序設計實驗項目繼承與接口成績學號XXXXXX姓名XXXXX實驗日期2012/10/13專業班級計算機科學與技術09級指導教師XXXXX一【實驗目的】掌握類和對象的創建方法理解繼承的相關概念掌握子類對象的創建過程掌握方法的繼承與重寫理解多態的概念與上轉型對象理解抽象類和接口的概念及特點二【實驗內容】【項目一】方法重寫定義父類People,分別定義People類的子類ChinaPeopleAmericanPeople和BeijingPeople并分別重寫父類中的各個方法。最后在主方法中分別創建各子類的對象并調用各自的方法打印輸出信息。該程序的模板代碼見附件/Example.java請將其補充完整并調試運行。(1)程序代碼classPeople{protecteddoubleweight,height;publicvoidspeakHello(){System.out.println("yayawawa");}publicvoidaverageHeight(){height=173;System.out.println("averageheight:"+height);}publicvoidaverageWeight(){weight=70;System.out.println("averageweight:"+weight);}}classChinaPeopleextendsPeople{//doubleweight,height;//重寫publicvoidspeakHello(方法，要求輸出類似“你好，吃了嗎”這樣的//漢語信息publicvoidspeakHello(){System.out.println(你好，你吃了嗎？")；}//重寫publicvoidaverageHeight(方法，要求輸出類似〃“中國人的平均身高：168.78厘米”這樣的漢語信息publicvoidaverageHeight(){height=168.78;System.out.println(中國人的平均身高”+height);}//重寫publicvoidaverageWeight(方法，//要求輸出類似“中國人的平均體重：65公斤”這樣的漢語信息publicvoidaverageWeight(){weight=65;System.out.println(中國人的平均體重"+weight);}publicvoidchinaGongfu(){//輸出中國武術的信息，例如:〃坐如鐘，站如松睡如弓〃等System.out.println(坐如鐘，站如松，睡如弓)；}}classAmericanPeopleextendsPeople{//重寫publicvoidspeakHello(方法，要求輸出類似//“Howdoyoud6'這樣的英語信息。publicvoidspeakHello(){System.out.println("Howdoyoudo");}//重寫publicvoidaverageHeight(方法publicvoidaverageHeight(){height=173;System.out.println("Americanaverageheight:"+height);}//重寫publicvoidaverageWeight方法publicvoidaverageWeight(){weight=70;System.out.println("Americanaverageweight:"+weight);}publicvoidamericanBoxing(){//輸出拳擊的信息，例如，“直拳”、“鉤拳”等System.out.println(直拳，上勾拳')；}}classBeijingPeopleextendsChinaPeople{//重寫publicvoidspeakHello(方法，要求輸出類似“您好”這樣的漢語信息publicvoidspeakHello(){System.out.println(您好啊！！！！！！！！！！！！")；}//重寫publicvoidaverageHeight(方法publicvoidaverageHeight(){height=175;System.out.println(北京人的平均身高"+height);}//重寫publicvoidaverageWeight(方法publicvoidaverageWeight(){weight=20;System.out.println(北京人的平均體重"+weight);}publicvoidbeijingOpera(){//輸出京劇的信息System.out.println(京劇？verygood!!");}}publicclassExample{publicstaticvoidmain(Stringargs[]){ChinaPeoplechinaPeople=newChinaPeople();AmericanPeopleamericanPeople=newAmericanPeople();BeijingPeoplebeijingPeople=newBeijingPeople();chinaPeople.speakHello();americanPeople.speakHello();beijingPeople.speakHello();chinaPeople.averageHeight();americanPeople.averageHeight();beijingPeople.averageHeight();chinaPeople.averageWeight();americanPeople.averageWeight();beijingPeople.averageWeight();chinaPeople.chinaGongfu();americanPeople.americanBoxing();beijingPeople.beijingOpera();beijingPeople.chinaGongfu();}}(2)運行結果D:\>jauacExample.JauaID：\>jauaExample你好，你吃了嗎？Howdoyoudo您好啊！！！！［!!!!中國入的平均身高=168.78Americanaverageheight:173.0北京人南豐舟身高=175.0中國入的平均’Americanaverageweight：70.0北京人的平均體重=20-0坐知中，拒口松，睡如弓直拳，上勾拳廳、劇？verygood!!蟲易鐘，站如松，睡如弓【項目二】上轉型對象類Employee為抽象類，具有子類YearWorker,MonthWorke和MonthWorke。YearWorker對象按年領取薪水，MonthWorke^月領取，MonthWorker按周領取。Employee類有一個抽象方法：publicabstractearnings();子類必須重寫父類l^earningsC方法，給出各自領取報酬的具體方式。在Company類中，使用employee數組作為成員，使用不同的子類對象作為數組元素的上轉型對象。該程序的模板代碼見附件/HardWorkjava請將其補充完整并調試運行。(1)程序代碼abstractclassEmployee{publicabstractdoubleearnings();}classYearWorkerextendsEmployee{publicdoubleearnings(){return12000;}}classMonthWorkerextendsEmployee{publicdoubleearnings(){return850;}}classWeekWorkerextendsEmployee{publicdoubleearnings(){return150;}}classCompany{Employee]]employee;doublesalaries=0;Company(Employee[]employee){this.employee=employee;}publicdoublesalariesPay()salaries=0;for(inti=0;i<employee.length;i++){salaries=salaries+employee[i].earnings();}returnsalaries;}}publicclassHardWork{publicstaticvoidmain(Stringargs[]){Employee]]employee=newEmployee[20];for(inti=0;i<employee.length;i++){if(i%3==0)employee[i]=newWeekWorker();elseif(i%3==1)employee[i]=newMonthWorker();elseif(i%3==2)employee[i]=newYearWorker();}Companycompany=newCompany(employee);System.out.println(公司年工資總額〃+company.salariesPay());}}(2)運行結果D:\>jauacHardUork.jauaD：\>jauaHardUork公司年工資總額:79000-0【項目三】接口讀懂/附件/Road.java源程序，按要求補充程序并調試運行。掌握接口的定義及其實現方法，學習接口回調的運用方法。(1)程序代碼interfaceComputerWeight{publicdoublecomputeWeight();}classTelevisionimplementsComputerWeight{ //實現computeWeight()方法。publicdoublecomputeWeight(){return75.5;}}classComputerimplementsComputerWeight{ //實現computeWeight()方法。publicdoublecomputeWeight(){return90.5;}}classWashMachineimplementsComputerWeight{ //實現computeWeight(方法。publicdoublecomputeWeight(){return120.5;}}classCar{ComputerWeight]]goods;doubletotalWeights=0;Car(ComputerWeight[]goods){this.goods=goods;}publicdoublegetTotalWeights(){totalWeights=0;//計算totalWeightsfor(inti=0;i<goods.length;i++)totalWeights=totalWeights+goods[i].computeWeight();returntotalWeights;publicclassRoad{publicstaticvoidmain(Stringargs[]){ComputerWeight[]goodsOne=newComputerWeight[50],goodsTwo=newComputerWeight[22];for(inti=0;i<goodsOne.length;i++){ if(i%3==0)goodsOne[i]=newTelevision();elseif(i%3==1)goodsOne[i]=newComputer();elseif(i%3==2)goodsOne[i]=newWashMachine();}for(inti=0;i<goodsTwo.length;i++){ if(i%3==0)goodsTwo[i]=newTelevision();elseif(i%3==1)goodsTwo[i]=newComputer();elseif(i%3==2)goodsTwo[i]=newWashMachine();}Car大貨^=newCar(goodsOne);System.out.printl