實(shí)驗(yàn)二繼承與接口實(shí)驗(yàn)

1、實(shí)驗(yàn)二繼承與接口、實(shí)驗(yàn)?zāi)康?. 掌握類的繼承機(jī)制。2. 熟悉類中成員變量和方法的訪問控制。3. 掌握接口與包的使用，熟悉方法的多態(tài)性。、實(shí)驗(yàn)內(nèi)容1. 定義父類及子類，在子類中重寫父類的方法2. 練習(xí)接口與包的使用三、實(shí)驗(yàn)步驟與要求第1題繼承編寫一個(gè)Java應(yīng)用程序，除了主類外，該程序中還有4個(gè)類：People,ChinaPeople, AmericanPeople和BeijingPeople類。此四個(gè)類的繼承關(guān)系如下圖 所示：要求 ChinaPeople，American 類均重寫其父類 People 類的 speakHello, averageHeight, averageweight 方法

2、，BeijingPeople 類重寫其父類 ChinaPeople類的 speakHello, averageHeight, averageWeight 方法。People 類protected double protected double變量heightweight方法public void speak Hello() public void averageHeight() public void averageWeight()源代碼：package people;class peopleprotected doubleheight ;protected doubleweight ;pub

3、lic void speakHello() 問候語的函數(shù)System.out .println( hello);public void averageHeight() / 人們的平均身高 height =170;System.out .println(+ height );public void averageWeight() / 人們的平均體重 weight =120;System.out .println(+ weight );class Chinapeople extends peoplepublic void speakHello()System.out .println(你好);pu

4、blic void averageHeight()height =172; System.out .println(+ height );public void averageWeight() weight =115;System.out .println(+ weight );public void chinaGongfu() / 中國功夫的方法System.out .println(中國功夫);class Americanpeople extends peoplepublic void speakHello()System.out .println( hello);public void

5、averageHeight()height =180;System.out .println(+ height );public void averageWeight() weight =150;System.out .println(+ weight );public void americanBoxing() / 美國拳擊的方法 System.out .println( americanBoxing);class Beijingpeople extends Chinapeoplepublic void speakHello()System.out .println(北京歡迎你);publi

6、c void averageHeight()height =168;System.out .println(+ height );public void averageWeight() weight =125;System.out .println(+ weight );class Examplepublic static void main(String args)people p = new people();Chinapeople c=new Chinapeople();Americanpeople a=new Americanpeople(); Beijingpeople b = ne

7、w Beijingpeople(); p.averageHeight();p.averageWeight();.speakHello();.averageHeight();c.averageWeight();c.ch inaGon gfu();c.speakHello();a.averageHeight();a.averageWeight();a.america nBox in g();a. speakHello();b. averageHeight();b.averageWeight();b.speakHello();結(jié)果截圖:L Problerrus 貓 Javadoc 么 Declara

8、tion Company Java3&06 雖歹也 3G&60晅 56J=F7t= 292&6第3題接口回調(diào)要求有一個(gè) ComputeTotalSales接口，該接口中有一個(gè)方法：public double totalSalesByYear(),有三個(gè)實(shí)現(xiàn)該接口的類：Television,Computer 和 Mobile。這 三個(gè)類通過實(shí)現(xiàn)接口 computeTotalSales，給出自己的年銷售額。有一個(gè) Shop 類，該類用 computeTotalSales 數(shù)組作為成員， computeTotalSales數(shù)組的單元可以存放Television對(duì)象的引用、Computer對(duì)象 的引用

9、或Mobile對(duì)象的引用。程序能輸出Shop對(duì)象的年銷售額。源代碼：package people;in terface ComputeTotalSalespublic double totalSalesByYear();class Television implements ComputeTotalSalespublic double totalSalesByYear()double sale=100;return sale*365;class computer implements ComputeTotalSalespublic double totalSalesByYear()double

10、 sale=200;return sale*365;class Mobile implements ComputeTotalSalespublic double totalSalesByYear()double sale=220;return sale*365;public class shop public static void main(String args)ComputeTotalSales c;c= new ComputeTotalSales3;c0= new Television();System. out .println(電視機(jī)的年銷售量：+ cO.totalSalesByYear();c1= new computer。；System. out .println(電腦的年銷售量：+ c1.totalSalesByYear();c2= new Mobile();System. out .println(手機(jī)的年銷售量：+ c2.totalSalesByYear();結(jié)果截圖:運(yùn)avadoc 凰 Declaration 貝 Console terminated shop Java Application C;Program Files