go-back-njava程序,真正的好东西

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1、国外教材《计算机网络》Go-Back-NJava程序，形象生动，学习效果很好。/**ThisGoBackNAppletwasdesignedtobeusedinconjunctionwith*nComputerNetworking：ATopDownApproach!r*byJamesKurose&KeithRoss.*Terminologyandspecificationsarcbasedupontheirdcscriptionofthe*GoBackNprotocolinchapter3,section4.**OriginalApplet

2、codedbyShamiulAzomasprojectassignedby*Prof.MartinReisslein,ArizoriaStateUniversity*CourseNo.EEE-459/591・Spring2001**AppletsignificantlyrevisedbyMatthewShatleyandChrisHoffman*forProfessorPaulD・Amer(amer@udel.edu)*UniversityofDelaware(2008)**AppletupdatedFeb.2012byChrisHoffm

3、antofixGoBackNtextoutput*toreflectthesingletimerimplementationofGoBackN,asoutlined*onpg234inthe5theditionoftheaforementionedtext.**Anoteonmagicnumbers：Magicnumbersarehorribletohaveinyourcodeingeneral.*However,thegraphicscomponentsofthisappletprovidednogoodwaytoremovethe*ma

4、gicnumbersfromthecodeaslocationsforobjectsarespecifiedinpixelcoordinates.*Weapologizeinadvanceforanyconfusionthismaycauseinreadingthecode.*/importjava.applet.Applet；importjava.awt.*；importjava.awt.event.ActionListener；importjava.awt.event.ActionEvent；publicclassGBNextendsA

5、ppletimplementsActionListener,Runnable{privatestaticfinalintADVANCEPACKET二5；//Defaultvaluesofparametersforanimation//scndcr_window_lcn_dcfthesendercanhaveamaximumof5outstanding//un-acknowledgedpacketsfinalintsender_window_len_def=5；//howmanypacketsthereceivercanholdinmemor

6、ywithoutdeliveringdata//inthecaseofGBNwecanhold1(orthecurrentpacket)inmemory//ifanotherpacketarrivestheoneinmemoryisdiscardedfinalintreceiverwindowlen二1；//GUTcomponentstodescribehowtheSimulationshouldbedrawnfinalintfinalintfinalmtfinalmtfinalintpack_width_dcf二10；pack_heigh

7、t_def=30；h_offset_def=100；voffsetdef二50；v_clearance_def=300；//usedfortimeoutvalues,thread,sleep()isspecifiedinmilliseconds//soweconverttosecondsfortimeoutprocessing.(1000milliseconds=1second)finalintTIMEOUT_MULTIPLIER二1000；finalintM1N_FPS=3；finalintFPS_STEP=2；finalintDESEL

8、ECTED二-1；finalintDEFAULT_FPS=5；//defauItto20packetsifnovalueissuppliedfinalinttotal_packe