java實(shí)驗(yàn)報(bào)告8

1、AU瑯廬/薯實(shí)驗(yàn)報(bào)告（2014 / 2015學(xué)年第2學(xué)期）課程名稱JAVA程序設(shè)計(jì)實(shí)驗(yàn)名稱抽象類和抽象方法實(shí)驗(yàn)時(shí)間2015年5 月 7日指導(dǎo)單位計(jì)算機(jī)學(xué)院/軟件學(xué)院軟件工程系指導(dǎo)教師周莉?qū)W生姓名班級(jí)學(xué)號(hào)學(xué)院（系）計(jì)算機(jī)軟件學(xué)專 業(yè)計(jì)算機(jī)科學(xué)與技院術(shù)實(shí)驗(yàn)名稱抽象類和抽象方法指導(dǎo)教師周莉?qū)嶒?yàn)類型上機(jī)實(shí)驗(yàn)學(xué)時(shí)2實(shí)驗(yàn)時(shí)間2015-5-7一. 實(shí)驗(yàn)?zāi)康?. 掌握多態(tài)的實(shí)現(xiàn)2. 掌握抽象類和抽象方法的定義和使用二、實(shí)驗(yàn)環(huán)境(實(shí)驗(yàn)設(shè)備)1. 每位學(xué)生配備計(jì)算機(jī)一臺(tái)2. 計(jì)算機(jī)需安裝好JDK和Jcreator三、實(shí)驗(yàn)內(nèi)容1. 首先編寫一個(gè)抽象類，要求該抽象類有3個(gè)抽象方法：Public abstract vo

2、id f( int x)；Public abstract double g(double x)；Public abstract double h(double x): 然后分別給出這個(gè)抽象類的3個(gè)子類。 要求：在應(yīng)用程序主類中使用這些子類創(chuàng)建對(duì)象，再讓它們的上轉(zhuǎn)型對(duì)象調(diào)用方法f()、 g()和 h()。(1)源程序:abstract class Apublic abstract void f(int x):public abstract void g(int x,int y):public abstract double h(double x):class Al extends Apublic

3、 void f(int x)public void g(int x,int y)int z二x+y；public double h(double x) return x*x；class A2 extends Apublic void f(int x)Hello：+x)；public void g(int x,int y)int z=x-y；public double h(double x)return (x)；class A3 extends Apublic void f(int x)你好：”+x)；public void g(int x,int y) double z= (double)x/

4、y；public double h(double x)return 1/x；public class ZuoYe5_2public static void main(String args) A a=new Al ():(10)；(12,20) ；a=new A2():(10)；(12,20) ；a=new A3():(10)；(12,20) ；(2)實(shí)驗(yàn)結(jié)果：2. 設(shè)計(jì)一個(gè)人員類(Person),其中包含一個(gè)方法pay,代表人員的工資支出。再?gòu)腜erson 類派生出助教類(Assistant)、講師類(Instructor副教授類(Assistant Professor) 和教授類(Prof

5、essor)o其中：工資支出二基本工資+授課時(shí)數(shù)*每課時(shí)兼課金。但助教基本工資為800,每課時(shí)兼課金25,講師基本工資為1000,每課時(shí)兼課金35, 副教授基本工資為1200,每課時(shí)兼課金40,教授基本工資為1400,每課時(shí)兼課金50。將Person定義為抽象類，pay為抽象方法，設(shè)計(jì)程序?qū)崿F(xiàn)多態(tài)性。(1) 源程序：abstract class Personprotected String name；protected double classum；public Person() =M Mclassum=0；public Person(String name,double classum)-n

6、ame；=classum；abstract public double pay ()；public String toStringO return姓名：+t 工資支出:+()+n；class Assistant extends Person!public .Assistant(String nametdouble classum) super(name.classum)；public double pay() return 800+classum*25；class Instructor extends Personpublic Instructor (String name,double cl

7、assum)super(name,classum)；public double pay() return 1000+classum*35；class AssistantProfesson extends Person!public AssistantProfesson(String name,double classum)super(name,classum)；public double pay() return 1200+classum*40；class Professor extends Personpublic Professor(String name,double classum)

8、super(rmme,classum)；public double pay()return 1400+classum*50；public class sy8_2public static void main(String args) Person ps二new Person4； ps0=new Assistant (張三,120)； psl=new Instructor(趙二130)； ps2=new AssistantProfessonC1* 李四”.125)； ps3=new Professor(王五,134)； String output二”； for (int i=0;i;i+) ou

9、tput+=psi:(2) 實(shí)驗(yàn)結(jié)果：C:Progra FilesJCreatorV3GE2001. exe |xiits岀岀出出 H 資資資資 工工工工3S00 弱5550 弱6200 0 8100.0any keyto continue . 3. 定義一個(gè)抽象類Bank,它包含有oneyearRate (定期利率)、oneyearNationaldebt (國(guó)債利率)和interestRate (活期利率)常數(shù)和count ()方法及show()方法。Count () 方法用于對(duì)本息合計(jì)(存款本金+利息)進(jìn)行計(jì)算，而show()方法用于對(duì)本息合計(jì)進(jìn)行 顯示。由于對(duì)不同的存款方式，利率是不同

10、的，因此此程序分別定義多個(gè)子類實(shí)現(xiàn)對(duì)抽 象類的繼承，實(shí)現(xiàn)對(duì)利率的計(jì)算和顯示。本程序定義了定期利率、活期利率、國(guó)債利率三種利率，按照一萬(wàn)元錢位存款單位 進(jìn)行統(tǒng)計(jì)，計(jì)算每種利率下存款一年后的本息合計(jì)。除了國(guó)債外，其他利率都要交納個(gè) 人所得稅20%。(1) 源程序： abstract class Bankprotected static final float oneyearRate=0.0178f；protected static final float oneyearNationaldebt=0.0198f；protected static final float interestRate=0.

11、0078f；abstract void count()；abstract void show():class InterestRateCalcute extends Bankprivate float saving；private double sum；InterestRateCalcute(float i)saving=i；count()；public void count()sum:zsaving+ (saving*；public void show()With current interest rate,sum=,，+sum):class OneyearNationa1debtCa1cu

12、te extends Bsnkprivate float saving；private double sum；OneyearNationaldebtCalcute(float i)saving=i；count()；public void count() sum-saving+(saving*：public void show()With national debt ratesunp+sum)；class OneyearRateCa1cute extends Bankprivate float saving；private double sum；OneyearRateCalcute(float

13、i)saving=i；count()；public void count()sumsaving+(saving*；public void show()With fixed rate,sum+sum):class Calculate!public static void main(String args)(int mon=10000；OneyearRateCalcute rate=new OneyearRateCalcute(mon):0；OneyearNationaldebtCalcute debt二new OneyearNationaldebtCalcute(mon)； 0；InterestRateCalcute interest=new InterestRateCalcute(mon)；0；(2) 實(shí)驗(yàn)結(jié)果：四