UpdateGroup
+inWhichN:int+timeUse:double
CheckDistance
+timeWaitBack:double[]+timeWmax:double[]+notes:ArrayList
Comparator
SortByPointX
Note
+ nName:String+nPoint:Point+nVue:Double+nDl:Double
+toString():Sting
Main
+ listback:ArrayListArrayList+nYuzhiback:double[]-timeUse;double
