實驗四Java繼承與接口【實驗目的】理解繼承原理與機制及類繼承的聲明方法掌握掌握成員變量的隱藏及方法的重寫掌握抽象類與抽象方法4）掌握super關鍵字5）掌握final關鍵字6）理4掌握接口聲明及使用【實驗環境】JDK1.6+Eclpise3.2【實驗準備】復習課件中理論知識練習課堂所講的例子【實驗內容】1Java3個類：People、ChinaPeople和AmericanPeople。該程序具體要求如下：PeoplepublicvoidspeakHello()publicvoidaverageHeight()和void方法。ChinaPeoplePeoplepublicvoidchinaGongfu()ChinaPeoplepublicvoidspeakHello()publicvoidaverageHeight()publicvoid方法。AmericanPeoplePeoplepublicvoidamericanBoxing()方法。要求AmericanPeople重寫父類的publicvoidspeakHello()、publicaverageHeight()publicvoidaverageWeight()方法。TestOne輸出信息。2、編寫一個Java應用程序，除了主類（TestTwo）外，該程序還有Shape接口、三角形類Triangle類、矩形Rectangle類。該程序具體要求如下：ShapepublicabstractdoublecomputeArea(doublea,double抽象方法。TriangleShapea底、b代表三角形的高。RectangleShapea底、bTestTwo（要求使用到多態性）【實驗過程及結果】實驗代碼及運行結果：packagefirst;publicclassTestfirst{publicstaticvoidmain(String[]args){Peoplepeople=newPeople();people.speakHello();people.averageHeigh();people.averageWeight();ewAmericanPeopleAmericanPeople();t(""chinapeople.speakHello();chinapeople.chinaGongfu();chinapeople.averageWeight();chinapeople.averageHeigh();t(""americanpeople.americanBoxing();americanpeople.speakHello();americanpeople.averageWeight();americanpeople.averageHeigh();}}packagefirst;publicclassAmericanPeopleextendsPeople{publicvoidamericanBoxing(){System.out.println("welikeboxing");}publicvoidspeakHello(){System.out.println("HELLO!!");}publicvoidaverageHeigh(){System.out.println("美國人的平均身高是170cm");}publicvoidaverageWeight(){System.out.println("美國人的平均體重是75kg");}}packagefirst;publicclassChinaPeopleextendsPeople{publicvoidchinaGongfu(){System.out.println("我們會少林寺功夫");}publicvoidspeakHello(){System.out.println("你好!!");}publicvoidaverageHeigh(){System.out.println("中國人的平均身高是167cm");}publicvoidaverageWeight(){System.out.println("中國人的平均體重是65kg");}}packagefirst;publicclassPeople{publicvoidspeakHello(){System.out.println("HELLO!!");}publicvoidaverageHeigh(){System.out.println("人的平均身高是00cm");}publicvoidaverageWeight(){System.out.println("人的平均體重是00kg");}}packagesecond;publicclassRectangleimplementsShape{publicdoublecomputeArea(doublea,doubleb){//doublek1=a*b;//doublek2=(a+b)*2;return(a*b);}}packagesecond;publicinterfaceShape{publicabstractdoublecomputeArea(doublea,doubleb);}packagesecond;publicclassTestsecond{publicstaticvoidmain(String[]args){ewdoubles1=puteArea(2.0,3.0);t("矩形的面積是："t( "ewdoubles2=puteArea(4.0,4.0);t("三角形的面積是："}}packagesecond