网络工程专业毕业英文翻译.docx

网络工程专业毕业英文翻译.docx

《网络工程专业毕业英文翻译.docx》由会员分享，可在线阅读，更多相关《网络工程专业毕业英文翻译.docx（11页珍藏版）》请在冰豆网上搜索。

网络工程专业毕业英文翻译

XX大学

毕业设计（论文）说明书

英文翻译

专业

网络工程

班级

网

姓名

XX

学号

指导教师

XX

二OXX年六月十六日

外文原文

IntroductiontoJava

autor：

MartinNgobye.

source：

ComputingStaticSliceforJavaPrograms

Javaoriginatedaspartofaresearchprojecttodevelopadvancedsoftwareforawidevarietyofnetworkdevicesandembeddedsystems.Thegoalwastodevelopasmall,reliable,portable,distributed,real-timeoperatingplatform.Whentheprojectstarted,C++wasthelanguageofchoice.ButovertimethedifficultiesencounteredwithC++grewtothepointwheretheproblemscouldbestbeaddressedbycreatinganentirelynewlanguageplatform.DesignandarchitecturedecisionsdrewfromavarietyoflanguagessuchasEiffel,SmallTalk,ObjectiveC,andCedar/Mesa.Theresultisalanguageplatformthathasprovenidealfordevelopingsecure,distributed,networkbasedend-userapplicationsinenvironmentsrangingfromnetwork-embeddeddevicestotheWorld-WideWebandthedesktop.

ThedesignrequirementsofJavaaredrivenbythenatureofthecomputingenvironmentsinwhichsoftwaremustbedeployed.

ThemassivegrowthoftheInternetandtheWorld-WideWebleadsustoacompletelynewwayoflookingatdevelopmentanddistributionofsoftware.Toliveintheworldofelectroniccommerceanddistribution,Javamustenablethedevelopmentofsecure,highperformance,andhighlyrobustapplicationsonmultipleplatformsinheterogeneous,distributednetworks.

Operatingonmultipleplatformsinheterogeneousnetworksinvalidatesthetraditionalschemesofbinarydistribution,release,upgrade,patch,andsoon.Tosurviveinthisjungle,Javamustbearchitectureneutral,portable,anddynamicallyadaptable.

TheJavasystemthatemergedtomeettheseneedsissimple,soitcanbeeasilyprogrammedbymostdevelopers;familiar,sothatcurrentdeveloperscaneasilylearnJava;objectoriented,totakeadvantageofmodernsoftwaredevelopmentmethodologiesandtofitintodistributedclient-serverapplications;multithreaded,forhighperformanceinapplicationsthatneedtoperformmultipleconcurrentactivities,suchasmultimedia;andinterpreted,formaximumportabilityanddynamiccapabilities.

Together,theaboverequirementscomprisequiteacollectionofbuzzwords,solet’sexaminesomeofthemandtheirrespectivebenefitsbeforegoingon.

What’scompletelynewisthemannerinwhichJavaanditsrun-timesystemhavecombinedthemtoproduceaflexibleandpowerfulprogrammingsystem..

DevelopingyourapplicationsusingJavaresultsinsoftwarethatisportableacrossmultiplemachinearchitectures,operatingsystems,andgraphicaluserinterfaces,secure,andhighperformance,WithJava,yourjobasasoftwaredeveloperismucheasier—youfocusyourfullattentionontheendgoalofshippinginnovativeproductsontime,basedonthesolidfoundationofJava.Thebetterwaytodevelopsoftwareishere,now,broughttoyoubytheJavalanguageplatform.

VerydynamiclanguageslikeLisp,TCL,andSmallTalkareoftenusedforprototyping.Oneofthereasonsfortheirsuccessatthisisthattheyareveryrobust—youdon’thavetoworryaboutfreeingorcorruptingmemory.

Similarly,programmerscanberelativelyfearlessaboutdealingwithmemorywhenprogramminginJava,Thegarbagecollectionsystemmakestheprogrammer’sjobvastlyeasier;withtheburdenofmemorymanagementtakenofftheprogrammer’sshoulders,storageallocationerrorsgoaway.AnotherreasoncommonlygiventhatlanguageslikeLisp,TCL,andSmallTalkaregoodforprototypingisthattheydon’trequireyoutopindowndecisionsearlyon—theselanguagesaresemanticallyrich.

Javahasexactlytheoppositeproperty:

itforcesyoutomakeexplicitchoices.Alongwiththesechoicescomealotofassistance—youcanwritemethodinvocationsand,ifyougetsomethingwrong,yougettoldaboutitatcompiletime.Youdon’thavetoworryaboutmethodinvocationerror.

TheJavabeginnermustgrasp30basicconcepts

Basicconcept

1.InOOPtheonlyrelationsiswhattheobject’sinterface,suchasthecomputersellerheleavesaloneinternalstructureofelectricalsource,butheisonlyconcernedaboutthatwhetherthepowerwillbesuppliedtoyou,alsosolongasknowcanornotbutisnothowandwhy.Allproceduresaremakeupofcertainattributeandthebehaviorobject,thedifferentobjectvisitinvokesthroughthefunctioninvocation,betweentheobjectallintercommunionareinvokethroughthemethodinvocation,Byobjectdataencapsulation,enhancesreuserateverymuch..

2.InOOPthemostimportantthoughtisclass,theclassisthetemplate,isablueprint,constructanobjectfromaclass,namelyconstructaninstanceoftheclass.

3.Encapsulation:

isthatcombinesthedataandthebehaviorinapackage）andhidesthedatatherealizationprocesstotheobjectuser,inanobjectdataiscalleditsinstancefield.

4.Throughexpandsaclasstoobtainanewclassiscalledinheritance,butallclassesareconstructedbytheobjectsuperrootclassofexpansion,superrootclassofasfollowscanmaketheintroduction.

5.Object3principalcharacteristics

　　Behavior---explainedthisobjectcanmakewhat.

　　Tate---whentheobjectexertsthemethodobjectreflection.

　　Dentity---andothersimilarbehaviorobjectsdiscriminationsymbols.

　　Eachobjecthasonlyindentityandamongthreecharacteristicstheyaffectmutually.

6.Relationsamongclasses:

　　Use-a:

Dependentrelation

　　Has-a:

Polymerizationrelation

　　Is-a:

inheritorrelation--example:

AclasshasinheritedBclass,thistimeAclassnotonlyhasBclassofmethod,butalsohasitsownmethod（Individualityexistsingeneralcharacter）

7.Structureobjectusestructure:

Structureproposing,thestructureisonespecialmethod,thestructureobjectandtoitsinitialization.

　　Example:

ADataclassofstructurecallsData

NewData（）---structureanewobject,alsoinitializecurrenttime.

Datahappyday=newData（）---anobjectevaluatesanvariablehappyday,thusenablesthisobjecttobeusedmanytimes,herebestatedthecausevariableandtheobjectvariablearedifferent.

Newreturnsthevalueisaquotation.

Constructorcharacteristic:

Theconstructormayhave0,oneormanyparameters

Theconstructorandtheclasshavethesamename

Aclassmayhavemanyconstructor.Theconstructorhasnotreturnedvalue

Theconstructoralwaysbetogetherusedwiththenewoperator

8.Overloading:

Whenmanymethodshavethesamenamewhenincludesthedifferentparameter,thenhastheoverloadingWhichmethoddoesthecompilerhavetochooseinvokes.

9.Package:

Javaallowoneormanyclassestobecometogetherasgroup,iscalledpackage,toorganizingdutyeasily,thestandardJavastorehousedividesintomanypackagesJava.Langjava.Utiljava,netandsoon,thepackageislayeredandalljavapackagesareinjavaandinajavaxpackage.

10.Extendablethought:

permittoconstructnewclassonexistingclasses,whenyouextendtheclasswhichalreadyexisted,thenyoureusethisclassofmethodandthefield,atthesametimeyoumightaddthenewmethodandthefieldinthenewclass.

11.Expandableclass:

Theexpandableclassfullymanifestedis-atoextendtherelationsTheformis:

Class（subclass）extends（baseclass）.

12.Multi-modality:

Injava,theobjectvariableismulti-modalityButinjavadoesnotsupportmultipleextend.

13.Dynamiccombine:

themechanismofinvokingobjectmethodmechanism.

1）compilerexaminesobjectstatementtypeandmethodname.

2）thecompilerexaminesthatmethodinvokesparametertype.

3）staticcombine:

Ifthemethodtypeispriavtestaticthefinal,compilercanaccuratelyknowwhichmethodshouldinvoke.

4）whentheprocedurerunsandusesdynamiccombinetoinvokeamethod,themethodeditionwhichthenhypothesizedmachinemustinvokextheobjectactualtypewhichaimsattomatch.

5）dynamiccombine:

isaveryimportantcharacteristic,itcancausetheproceduretochangeagainmayexpandbutdoesnotneedtotranslatehassavedthecode.

14.Finalclass:

Inordertopreventotherpeoplederivethenewclassfromyoursclass,thisclassiscannotexpanded.

15.Thedynamicinvocationspendlongertimethanthestaticinvocationexpenditure.

16.Abstractclass:

Stipulatedormanyabstractmethodsclassofitselfmustdefineisabstract.Example:

PublicabstractstringgetDescripition

17.InJavaeachclassisbeextendedbyobjectclass.

18.equalandtoStringmethodinobjectclass.Equalusesintestinganobjectiswhetherequalwithanotherobject.ToStringreturnstorepresentthisobjectthestringofcharacter,eachclasscannearlyoverloadingthismethod,inordertoreturnstothecurrentconditionthecorrectexpression.（ThetoStringmethodisaveryimportantmethod）

19.Generalprogramming:

Anyclassoftypeallvaluesallmayreplacewithaobjectclassofvariable.

20.Thearraytabulates:

TheArrayListdynamicarraytabulates,isaclassofstorehouse,definesinjava.Inuitlpackage,butautomaticcontrolarraysize.

21.inclassandclassofobject,getclassmethodreturnstotheclasstypeanexample,whentheprocedurestartcontainscanincreaseinthemainmethodclass,hypothesizedconfidentialincreaseallclasseswhichheneeds,eachincreaseclassallmustincreasetheclasswhichitneeds.

22.Theclass:

classmightdynamicoperatethejavacodeforthecompilationtheproceduretoprovidetheformidablefunctionreflection,thisfunctionwasJavaBeansisspeciallyuseful,theusereflectedJavatobeabletosupporttheVBprogrammertobefamiliarwiththeusethetool.

procedureofanalysisclassabilityiscalledthereflector,inJavatoprovidethisfunctionthepackagetocallJava.Lang.Thereflectreflectionmechanismisextremelyformidable.

1）whenrunanalysi