public class Room 
{
    private String description;
    private HashMap <String, Room> exits;        // stores exits of this room.
 
 
    /**
     * Create a room described "description" with a given image. 
     * Initially, it has no exits. "description" is something like 
     * "in a kitchen" or "in an open court yard".
     */
    public Room(String description) 
    {
        this.description = description;
        exits = new HashMap <String, Room> ();
 
    }
 
    /**
     * Define an exit from this room.
     */
    public void setExit(String direction, Room neighbor) 
    {
        exits.put(direction, neighbor);
    }
 
    /**
     * Return the description of the room (the one that was defined in the
     * constructor).
     */
    public String getShortDescription()
    {
        return description;
    }
 
    /**
     * Return a long description of this room, in the form:
     *     You are in the kitchen.
     *     Exits: north west
     */
    public String getLongDescription()
    {
        return "You are " + description + ".\n" + getExitString();
    }
 
    /**
     * Return a string describing the room's exits, for example
     * "Exits: north west".
     */
    private String getExitString()
    {
        String returnString = "Exits:";
        for (Object key : exits.keySet()) {
            returnString += " " + key;
        }
        return returnString;
    }
 
    /**
     * Return the room that is reached if we go from this room in direction
     * "direction". If there is no room in that direction, return null.
     */
    public Room getExit(String direction) 
    {
        return (Room)exits.get(direction);
    }
 
 
}