Java双语实验报告 Polymorphism and Package.docx
《Java双语实验报告 Polymorphism and Package.docx》由会员分享，可在线阅读，更多相关《Java双语实验报告 Polymorphism and Package.docx（12页珍藏版）》请在冰豆网上搜索。
Java双语实验报告PolymorphismandPackage
Report
Class：
Name：
No.：
Course
JavaProgrammingLanguage
Experiment
Name
PolymorphismandPackage
Type
Verify
Demo
Integrated
Design
Teacher
Score
1.Goalofthisexperiment
（1）Knowhowtousejavainpolymorphic.
（2）Useobjects,classes,andpackagesupthetransition.
（3）Useconstructiontoolsandachievejavaapplication
2.Procedures
（1）Aprogram，Usingpackage,finalandabstractkeyword：
①Enterthefollowingprocedureandunderstandpackage,finalandabstractkeyword.
②Modifythesourcecodetomakeiteffective.Summaryofprogramfeaturesandlearnhowtousethepackage,finalandabstractkeyword.
③Notetheuseofthepackageprogrammustbecompiledwiththefollowingcommand
javac–d.PackTest.java
javacn.mybole.PackTest
④Saytheroleofeachline
⑤Tellhowtorunthisprogramonanothercomputer
（2）Acomplexprocess:
①Enterthefollowingprogramandunderstandabstractclassesandinheritance.
②Modifythesourcecodetomakeitbetter.Summaryofprogramfeaturesandlearnhowtousepolymorphism.
③Tellthemeaningofeachlineofcode.
（3）Astaticpolymorphismprogram
①Enterthefollowingstaticmethodsandproceduresandunderstandpolymorphism.
②Runtheprogramoutcome.
③Summaryofprogramfeaturesandlearnhowtousepolymorphism.
④Tellthemeaningofeachlineofcode
（4）Addanattributewagesalaryinexampleone.Modifythesourcecodetotrytousepolymorphismtoachieve.
3.Recordingoforiginaldataorresult
（1）oneprogram，usepackage,finalandabstractkeyword：
packagecom.bakahoshi.main;
publicabstractclassTest{
publicfinalvoidpubMethod（）{
System.out.println（"pubMethod"）;
}
protectedabstractvoidproMethod（）;
voiddefMethod（）{
System.out.println（"defMethod"）;
}
privatevoidpriMethod（）{
System.out.println（"priMethod"）;
}
publicstaticvoidmain（String[]args）{
Testt=newTest（）{
@Override
protectedvoidproMethod（）{
//TODOAuto-generatedmethodstub
System.out.println（"proMethod"）;
}
};
t.pubMethod（）;
t.proMethod（）;
t.defMethod（）;
t.priMethod（）;
}
}
Useananonymousclassthatimplementstheabstractclasstospecificimplementation-definedmethod
（2）Acomplexprocess:
packagecom.bakahoshi.main;
abstractclassEmployee{
privateStringname;
publicEmployee（Stringname）{
this.setName（name）;
}
publicStringgetName（）{
returnname;
}
publicvoidsetName（Stringname）{
this.name=name;
}
publicabstractdoublecomputeSalary（）;
}
classManagerextendsEmployee{
privatedoublemonthSalary;
publicManager（Stringname,doublemonthSalary）{
super（name）;
this.monthSalary=monthSalary;
}
@Override
publicdoublecomputeSalary（）{
returnmonthSalary;
}
/**
*@returnthemonthSalary
*/
publicdoublegetMonthSalary（）{
returnmonthSalary;
}
/**
*@parammonthSalarythemonthSalarytoset
*/
publicvoidsetMonthSalary（doublemonthSalary）{
this.monthSalary=monthSalary;
}
}
classSalesmanextendsEmployee{
privatedoublebaseSalary;
privatedoublecommision;
privateintqualtities;
publicSalesman（Stringname,doublebaseSalary,
doublecommision,intqualtities）{
super（name）;
this.baseSalary=baseSalary;
mision=commision;
this.qualtities=qualtities;
}
@Override
publicdoublecomputeSalary（）{
returnbaseSalary+commision*qualtities;
}
/**
*@returnthebaseSalary
*/
publicdoublegetBaseSalary（）{
returnbaseSalary;
}
/**
*@parambaseSalarythebaseSalarytoset
*/
publicvoidsetBaseSalary（doublebaseSalary）{
this.baseSalary=baseSalary;
}
/**
*@returnthecommision
*/
publicdoublegetCommision（）{
returncommision;
}
/**
*@paramcommisionthecommisiontoset
*/
publicvoidsetCommision（doublecommision）{
mision=commision;
}
/**
*@returnthequaltities
*/
publicintgetQualtities（）{
returnqualtities;
}
/**
*@paramqualtitiesthequaltitiestoset
*/
publicvoidsetQualtities（intqualtities）{
this.qualtities=qualtities;
}
}
classWorkerextendsEmployee{
privatedoubledailySalary;
privateintdays;
publicWorker（Stringname,doubledailySalary,intdays）{
super（name）;
this.dailySalary=dailySalary;
this.days=days;
}
@Override
publicdoublecomputeSalary（）{
returndailySalary*days;
}
/**
*@returnthedailySalary
*/
publicdoublegetDailySalary（）{
returndailySalary;
}
/**
*@paramdailySalarythedailySalarytoset
*/
publicvoidsetDailySalary（doubledailySalary）{
this.dailySalary=dailySalary;
}
/**
*@returnthedays
*/
publicintgetDays（）{
returndays;
}
/**
*@paramdaysthedaystoset
*/
publicvoidsetDays（intdays）{
this.days=days;
}
}
publicclassEmployeeDemo{
publicstaticvoidmain（Stringargs[]）{
Managere1=newManager（"John",10000）;
Salesmane2=newSalesman（"Smith",2000,50.4,63）;
Workere3=newWorker（"Bill",79.5,28）;
System.out.println（"Manager"+e1.getName（）+"salary:
"
+puteSalary（））;
System.out.println（"Salesman"+e2.getName（）+"salary:
"
+puteSalary（））;
System.out.println（"Worker"+e3.getName（）+"salary:
"
+puteSalary（））;
}
}
（3）Aprogramusingstaticpolymorphism
packagecom.bakahoshi.main;
classStaticSuper{
publicstaticStringstaticGet（）{
return"BasestaticGet（）";
}
publicStringdynamicGet（）{
return"BasedynamicGet（）";
}
}
classStaticSubextendsStaticSuper{
publicstaticStringstaticGet（）{
return"DerivedstaticGet（）";
}
publicStringdynamicGet（）{
return"DeriveddynamicGet（）";
}
}
publicclassStaticPolymorphism{
publicstaticvoidmain（String[]args）{
StaticSupersup=newStaticSub（）;//Upcast
System.out.println（StaticSuper.staticGet（））;
System.out.println（sup.dynamicGet（））;
}
}
Theresult:
BasestaticGet（）
DeriveddynamicGet（）
Reason:
Staticmethodsaremembersbelongtotheclassmembers,ratherthaninstancesofobjects
（4）Procedure:
AftermodifyingtheEmployeeclasscode
abstractclassEmployee{
privateStringname;
privatedoublesalary;
publicEmployee（Stringname）{
this.setName（name）;
}
publicStringgetName（）{
returnname;
}
publicvoidsetName（Stringname）{
this.name=name;
}
publicabstractdoublecomputeSalary（）;
/**
*@returnthesalary
*/
publicdoublegetSalary（）{
returnsalary;
}
/**
*@paramsalarythesalarytoset
*/
publicvoidsetSalary（doublesalary）{
this.salary=salary;
}
}
4.Resultandanalysis
（1）Programwithonepackage、finalandabstractkeyword：
Analysis:
javainallinstancemethods（ienon-staticmethodmodified）andnon-finalmethodsarevirtualmethodsaredynamicallyassignedatruntime,soallmethodcallswillbebasedontheactualtypeoftheobjectratherthanthestatictypeofdispatchmethod.Thestaticmethods,finalmethods,theparentclassmethodsandinstanceconstructorscollectively,includingnon-virtualmethoddispatchthesemethodsatcompileanalyticalmethodshavebeencompleted.
（2）Acomplexprocess:
Analysis:
dittoaproblem:
allinstancesofmethodsarevirtualmethods
（3）Amulti-stateandthestatickeywordprogram
Analysis:
Staticmethodsaremembersbelongtotheclassmembers,ratherthaninstancesofobjects
Signature:
Date:
升级会员 