Java在Hashmap中读取并放入Hashmap

Question

此问题涉及如何将乘客类型的对象添加到位于4个站的Hashmap中的Hashmap中。我的TrainStation对象包含一个站号ID，旅客对象包含一个乘客信息，包括将要映射到的车站。

public class TrainStation extends Actor {
int id;

public int getId() {
    return id;
}

public TrainStation(int id) {
    this.setColor(Color.black);
    this.id = id;
}
public static Map<Integer,Passenger> passengersDepart = new HashMap<>();

public class Passenger {
int id;
int appearTimeStep;
int originStationId;
int destinationStationsId;
int tripStartTimeStep;
int tripEndTimeStep;
int traveTime;

public Passenger(int id, int appearTimeStep, int originStationId, int  destinationStationId) {
    this.id = id;
    this.appearTimeStep = appearTimeStep;
    this.originStationId = originStationId;
    this.destinationStationsId = destinationStationId;
}

4个站点被添加到主站点中，并存储在Dataset类文件中站点的单独静态映射中（未显示）。我从CSV中读取了乘客信息，并根据他们的车站字段对其进行了排序，并希望将其添加到相应的车站乘客地图中。

    public static void readData(String path) throws IOException {
        BufferedReader pBufferedReader = new BufferedReader(new FileReader(path));
        String newline;

        //read header, output index number of each item
        String[] header = pBufferedReader.readLine().split(",");
        int idIndex = findPositionInArray("id", header);
        int appearTimeStepIndex = findPositionInArray("appearTimeStep", header);
        int originStationId = findPositionInArray("originStationId", header);
        int destinationStationsId = findPositionInArray("destinationStationId", header);

        //read body lines
        while ((newline = pBufferedReader.readLine()) != null) {
            String[] lineElements = newline.split(",");
            int id = Integer.parseInt(lineElements[idIndex]);
            int tStep = Integer.parseInt(lineElements[appearTimeStepIndex]);
            int oId = Integer.parseInt(lineElements[originStationId]);
            int dId = Integer.parseInt(lineElements[destinationStationsId]);
            Passenger passenger = new Passenger(id, tStep, oId, dId);
            //I NEED THIS TO ACCESS EACH INDIVIDUAL STATION MAP
            if (passenger.destinationStationsId == 1) {
                DataSet.tsMap.put(passenger.getId(), passenger);
            }
            else if (passenger.destinationStationsId == 2){
                TrainStation.passengersDepart.put(passenger.getId(), passenger);
            }
            else if (passenger.destinationStationsId == 3) {
                TrainStation.passengersDepart.put(passenger.getId(), passenger);
            }
            else {
                TrainStation.passengersDepart.put(passenger.getId(), passenger);
            }
        }

        pBufferedReader.close();
    }

我面临的挑战是将通过CSV创建的旅客对象放入火车站的哈希图中（无论如何它不会去，因为它是旅客而不是火车站类型），而是放在人员列表中火车站哈希图中的哈希图。