arrays - quia阵列-全能

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1、ArraysArraysaredatastructuresconsistingofrelateddataitemsofthesametypeusingcontiguousmemorylocations.We’llbeusingstaticarrays(staysthesameuseoncecreated).ArrayelementsarenumberedthesameasC++numberingscheme.(0èn-1,wherenisthearraysize.)myarray[0]=7myarray[1]=198myarray[2]

2、=-225myarray[3]=-75myarray[4]=4myarray[5]=118myarray[6]=-36myarray[7]=94EveryarrayisJavaknowsitsownlengthandmaintainsthisinformationinavariablecalledlength.myarray.lengthArrays:DeclaringandAllocatingArraysareallocateddynamicallywiththenewoperator.intmyarray[]=newint[4];o

3、rintmyarray[];myarray=newint[4];orStringpalindrome[]=newString[50],reverse[]=newString[50];ordouble[]sal1,sal2;//arraytypeandbracketscanbeusedatthe//beginningtoindicatethatallidentifierslistedrepresentarrays.Allocatingarraysandinitializingitselements:Lookp318InitArrayPro

4、gramInitializerListsinttemp[]={50,60,70,80,90,100};arraysizeisdeterminedbythenumberofelementsintheinitializerlist.newisnotrequiredwhenusinginitializerlists.Lookp320UseofinitializerlistfinalislikeconstfromC++ExamplesofArrays:SummingtheElementsofanArrayp322Histogramsp323**

5、*ElementsasCountersp325(RollDie)StudentPollProgramp326Assignment:FrequencyofDieSumsProgramSimulatetherollingoftwodice.Useyourroll()method.Sumtherolls(numbersshouldvaryfrom2to12).Yourprogramshouldrollthedie36,000times.Useasingle-subscriptedarraytotallythenumbersoftimeseac

6、hpossiblesumappears.DisplaythecompletefrequencyarrayinadialogboxusingJTextArea.Lookatpage325.