public?class?Bus?{
	static?int?busIFS=100;???????//信道幀間間隔（競爭者等待時間=信道幀間間隔+回退時間），單位為ms
	??????????????????????????????//為了簡便，只設置了最短幀間間隔
	static?int?busState=0;???????//信道狀態：0為信道空閑，1為信道忙
	static?double?utilRate;??????//信道利用率
	static?double?totalTime=0;??//總時間，單位為s.??totalTime=busNowTime-busTotalTime
	static?double?usedTime=0;???//信道處于繁忙（被占用的時間）單位為s
??	static?double?busStartTime;??//單位為s
????static	double?busNowTime;????//單位為s?

	
????public?static?double?getRate（）??//獲得信道利用率
????{???getTotalTime（）;
????	return?usedTime/totalTime;
????}
????
????public?static?void?getTotalTime（）
	?{???
	??????Bus.busNowTime=new?Double（（System.nanoTime（））/Math.pow（10?9））.doubleValue（）;
	??????Bus.totalTime=Bus.busNowTime-Bus.busStartTime;
	?}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1089??2009-06-24?13:54??CSMACD\dead.jpg

?????文件???????1141??2009-06-24?12:46??CSMACD\sending.jpg

?????文件???????1176??2009-06-24?13:53??CSMACD\unworking.jpg

?????文件???????2463??2009-06-23?23:09??CSMACD\link.jpg

?????文件????????616??2009-06-24?17:03??CSMACD\WindowCenter.java

?????文件????????860??2009-06-24?21:35??CSMACD\Bus.java

?????文件???????5416??2009-06-24?22:51??CSMACD\Competitor.java

?????文件??????12008??2009-06-24?21:34??CSMACD\CSMACDControl.java

?????目錄??????????0??2009-06-24?22:32??CSMACD

-----------?---------??----------?-----??----

????????????????24769????????????????????9