實(shí)驗(yàn)四：Java繼承與接口(bo)

實(shí)驗(yàn)四Java繼承與接口【實(shí)驗(yàn)?zāi)康摹坷斫饫^承原理與機(jī)制及類(lèi)繼承的聲明方法掌握掌握成員變量的隱藏及方法的重寫(xiě)掌握抽象類(lèi)與抽象方法4）掌握super關(guān)鍵字5）掌握f(shuō)inal關(guān)鍵字6）理4掌握接口聲明及使用【實(shí)驗(yàn)環(huán)境】JDK1.6+Eclpise3.2【實(shí)驗(yàn)準(zhǔn)備】復(fù)習(xí)課件中理論知識(shí)練習(xí)課堂所講的例子【實(shí)驗(yàn)內(nèi)容】1Java3個(gè)類(lèi)：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(xiě)父類(lèi)的publicvoidspeakHello()、publicaverageHeight()publicvoidaverageWeight()方法。TestOne輸出信息。2、編寫(xiě)一個(gè)Java應(yīng)用程序，除了主類(lèi)（TestTwo）外，該程序還有Shape接口、三角形類(lèi)Triangle類(lèi)、矩形Rectangle類(lèi)。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(tài)性）【實(shí)驗(yàn)過(guò)程及結(jié)果】實(shí)驗(yàn)代碼及運(yùn)行結(jié)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(guó)人的平均身高是170cm");}publicvoidaverageWeight(){System.out.println("美國(guó)人的平均體重是75kg");}}packagefirst;publicclassChinaPeopleextendsPeople{publicvoidchinaGongfu(){System.out.println("我們會(huì)少林寺功夫");}publicvoidspeakHello(){System.out.println("你好!!");}publicvoidaverageHeigh(){System.out.println("中國(guó)人的平均身高是167cm");}publicvoidaverageWeight(){System.out.println("中國(guó)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