城市交通咨询系统类图

根据提供的引用内容，可以得知该交通咨询系统主要包含城市地图类、站点类、弗洛伊德算法类、文件读写类、工具类和可视化界面类。因此，该系统的类图如下所示：

@startuml
class CityMap {
    -cityList: List<City>
    -edgeList: List<Edge>
    +addCity(city: City): void
    +addEdge(edge: Edge): void
    +getCityByName(name: String): City
    +getEdgeByStartAndEnd(start: City, end: City): Edge
}

class City {
    -name: String
    -x: int
    -y: int
    +getName(): String
    +getX(): int
    +getY(): int
}

class Edge {
    -start: City
    -end: City
    -distance: double
    -time: double
    -cost: double
    +getStart(): City
    +getEnd(): City
    +getDistance(): double
    +getTime(): double
    +getCost(): double
}

class FloydAlgorithm {
    -distance: double[][]
    -path: int[][]
    +calculateShortestPath(cityMap: CityMap): void
    +getShortestDistance(start: City, end: City): double
    +getShortestPath(start: City, end: City): List<City>
}

class FileIO {
    +readCityMapFromFile(fileName: String): CityMap
    +writeCityMapToFile(cityMap: CityMap, fileName: String): void
    +readEdgeFromFile(fileName: String): List<Edge>
    +writeEdgeToFile(edgeList: List<Edge>, fileName: String): void
}

class Utils {
    +calculateTime(distance: double, speed: double): double
}

class Visualization {
    -cityMap: CityMap
    +displayCityMap(): void
    +displayShortestPath(start: City, end: City): void
}

CityMap "1" *-- "0..*" City
CityMap "1" *-- "0..*" Edge
Edge "1" -- "1" City
FloydAlgorithm "1" -- "1" CityMap
Visualization "1" -- "1" CityMap
@enduml