import java.util.Set; import java.util.HashMap; import java.util.Iterator; /** * Class Room - a room in an adventure game. * * This class is part of the "World of Zuul" application. * "World of Zuul" is a very simple, text based adventure game. * * A "Room" represents one location in the scenery of the game. It is * connected to other rooms via exits. For each existing exit, the room * stores a reference to the neighboring room. * * @author Michael Kolling and David J. Barnes * @version 2006.03.30 */ public class Room { private String description; private HashMap exits; // stores exits of this room. /** * Create a room described "description". Initially, it has * no exits. "description" is something like "a kitchen" or * "an open court yard". * @param description The room's description. */ public Room(String description) { this.description = description; exits = new HashMap(); } /** * Define an exit from this room. * @param direction The direction of the exit. * @param neighbor The room to which the exit leads. */ public void setExit(String direction, Room neighbor) { exits.put(direction, neighbor); } /** * @return The short description of the room * (the one that was defined in the constructor). */ public String getShortDescription() { return description; } /** * Return a description of the room in the form: * You are in the kitchen. * Exits: north west * @return A long description of this room */ public String getLongDescription() { return "You are " + description + ".\n" + getExitString(); } /** * Return a string describing the room's exits, for example * "Exits: north west". * @return Details of the room's exits. */ private String getExitString() { String returnString = "Exits:"; Set keys = exits.keySet(); for(String exit : keys) { returnString += " " + exit; } 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. * @param direction The exit's direction. * @return The room in the given direction. */ public Room getExit(String direction) { return exits.get(direction); } }