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1、Arrays(subjectofLab7)Anarrayisacontainerobjectthatholdsafixednumberofvaluesofasingletype.Thelengthofanarrayisestablishedwhenthearrayiscreated.Aftercreation,itslengthisfixed.You'veseenanexampleofarraysalready,inthemainmethodofthe"HelloWorld!"application.Anarrayo
2、ftenelementsEachiteminanarrayiscalledanelement,andeachelementisaccessedbyitsnumericalindex.Asshownintheaboveillustration,numberingbeginswith0.The9thelement,forexample,wouldthereforebeaccessedatindex8.Thefollowingprogram,ArrayDemo,createsanarrayofintegers,putsso
3、mevaluesinit,andprintseachvaluetostandardoutput.classArrayDemo{publicstaticvoidmain(String[]args){int[]anArray;//declaresanarrayofintegersanArray=newint[10];//allocatesmemoryfor10integersanArray[0]=100;//initializefirstelementanArray[1]=200;//initializesecondel
4、ementanArray[2]=300;//etc.anArray[3]=400;anArray[4]=500;anArray[5]=600;anArray[6]=700;anArray[7]=800;anArray[8]=900;anArray[9]=1000;System.out.println("Elementatindex0:"+anArray[0]);System.out.println("Elementatindex1:"+anArray[1]);System.out.println("Elementat
5、index2:"+anArray[2]);System.out.println("Elementatindex3:"+anArray[3]);System.out.println("Elementatindex4:"+anArray[4]);System.out.println("Elementatindex5:"+anArray[5]);System.out.println("Elementatindex6:"+anArray[6]);System.out.println("Elementatindex7:"+an
6、Array[7]);System.out.println("Elementatindex8:"+anArray[8]);System.out.println("Elementatindex9:"+anArray[9]);}}Theoutputfromthisprogramis:Elementatindex0:100Elementatindex1:200Elementatindex2:300Elementatindex3:400Elementatindex4:500Elementatindex5:600Elementa
7、tindex6:700Elementatindex7:800Elementatindex8:900Elementatindex9:1000Inareal-worldprogrammingsituation,you'dprobablyuseoneofthesupportedloopingconstructs(for,while,do,etc.)toiteratethrougheachelementofthearray,ratherthanwriteeachlineindividuallyasshownabove.How
8、ever,thisexampleclearlyillustratesthearraysyntax.DeclaringaVariabletoRefertoanArrayTheaboveprogramdeclaresanArraywiththefollowinglineofcode:int[]anArray;//declaresanarrayofi
