Java语言程序设计10E LiangPPT习题案例08slide.ppt

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1、1Chapter8MultidimensionalArrays2MotivationsThusfar,youhaveusedone-dimensionalarraystomodellinearcollectionsofelements.Youcanuseatwo-dimensionalarraytorepresentamatrixoratable.Forexample,thefollowingtablethatdescribesthedistancesbetweenthecitiescanberepresentedusingatwo-

2、dimensionalarray.3Motivations4ObjectivesTogiveexamplesofrepresentingdatausingtwo-dimensionalarrays(§8.1).Todeclarevariablesfortwo-dimensionalarrays,createarrays,andaccessarrayelementsinatwo-dimensionalarrayusingrowandcolumnindexes(§8.2).Toprogramcommonoperationsfortwo-d

3、imensionalarrays(displayingarrays,summingallelements,findingtheminimumandmaximumelements,andrandomshuffling)(§8.3).Topasstwo-dimensionalarraystomethods(§8.4).Towriteaprogramforgradingmultiple-choicequestionsusingtwo-dimensionalarrays(§8.5).Tosolvetheclosest-pairproblemu

4、singtwo-dimensionalarrays(§8.6).TocheckaSudokusolutionusingtwo-dimensionalarrays(§8.7).Tousemultidimensionalarrays(§8.8).5Declare/CreateTwo-dimensionalArrays//DeclarearrayrefvardataType[][]refVar;//CreatearrayandassignitsreferencetovariablerefVar=newdataType[10][10];//C

5、ombinedeclarationandcreationinonestatementdataType[][]refVar=newdataType[10][10];//AlternativesyntaxdataTyperefVar[][]=newdataType[10][10];6DeclaringVariablesofTwo-dimensionalArraysandCreatingTwo-dimensionalArraysint[][]matrix=newint[10][10];orintmatrix[][]=newint[10][1

6、0];matrix[0][0]=3;for(inti=0;i

7、gShorthandNotationsYoucanalsouseanarrayinitializertodeclare,createandinitializeatwo-dimensionalarray.Forexample,int[][]array=newint[4][3];array[0][0]=1;array[0][1]=2;array[0][2]=3;array[1][0]=4;array[1][1]=5;array[1][2]=6;array[2][0]=7;array[2][1]=8;array[2][2]=9;array[

8、3][0]=10;array[3][1]=11;array[3][2]=12;int[][]array={{1,2,3},{4,5,6},{7,8,9},{10,11,12}};Sameas9LengthsofTwo-d