编辑：如果我不清楚（对不起，我是 Java 的初学者），我只是想增加将项目添加到房间的可能性，但是，我希望项目方面像现在一样属于自己的类。尽管在目前的状态下，它不起作用。
我试图让项目出现在我的游戏的房间中，所以我制作了一个单独的项目类，其中相关代码是
public class Items
{
private String itemDescription;
private int itemWeight;
/**
* Add an item to the Room
* @param description The description of the item
* @param weight The item's weight
*/
public void addItem(String description, int weight)
{
itemDescription = description;
itemWeight = weight;
}
/**
* Does the room contain an item
* @param description the item
* @ return the item's weight or 0 if none
*/
public int containsItem(String description)
{
if (itemDescription.equals(description))
{
return itemWeight;
}
else
{
return 0;
}
}
/**
* Remove an item from the Room
*/
public String removeItem(String description)
{
if (itemDescription.equals(description))
{
String tmp = itemDescription;
itemDescription = null;
return tmp;
}
else
{
System.out.println("This room does not contain" + description);
return null;
}
}
public String getItemDescription()
{
return this.itemDescription;
}
public void setItemDescription(String itemDescription)
{
this.itemDescription = itemDescription;
}
public int getItemWeight()
{
return this.itemWeight;
}
public void setItemWeight(int itemWeight)
{
this.itemWeight = itemWeight;
}
public String getCharacter()
{
return this.character;
}
public void setCharacter(String character)
{
this.character = character;
}
}
在我单独的游戏类中，我尝试将它链接到我的游戏类中，就像这样
// initialise room exits
outside.setExit("north", lab);
outside.addItem("notebook", 2);
就像我对游戏的出口所做的那样。但是，我收到一条错误消息
The method addItem(String, int) is undefined for the type
Room
这是房间类
import java.util.HashMap;
import java.util.Set;
import java.util.ArrayList;
public class Room
{
private String description;
private HashMap<String, Room> exits;
/*
private ArrayList<Item> items;
*/
//private HashMap<String, Item> items;
public Items item;
// Characters in the room
private String character;
/**
* 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<String, Room>();
}
/**
* Define the exits of this room. Every direction either leads
* to another room or is null (no exit there).
* @param north The north exit.
* @param east The east east.
* @param south The south exit.
* @param west The west exit.
* @param up The upwards exit.
* @param down The downwards exit.
*
*/
/**
* Define an exit from this room.
* @param direction The direction of the exit.
* @param neighbor The room in the given direction.
*/
public void setExit(String direction, Room neighbor)
{
exits.put(direction, neighbor);
}
public Room getExit(String direction)
{
return exits.get(direction);
}
/**
* Return a description of the room’s exits,
* for example "Exits: north west".
* @return A description of the available exits.
*/
public String getExitString()
{
String returnString = "Exits:";
Set<String> keys = exits.keySet();
for(String exit : keys)
{
returnString += " " + exit;
}
return returnString;
}
/**
* @return The description of the room.
*/
public String getDescription()
{
return description;
}
/**
* Return a long description of this room, of the form:
* You are in the kitchen.
* Exits: north west
* @return A description of the room, including exits.
*/
public String getLongDescription()
{
return "You are " + description + ".\n" + getExitString();
}
}
游戏类，房间本身就是制作的
import java.util.ArrayList;
public class Game
{
private Parser parser;
private Room currentRoom;
private ArrayList items;
private ArrayList weights;
private int totalWeight;
private final int MAX_WEIGHT = 10;
/**
* Create the game and initialise its internal map.
*/
public Game()
{
createRooms();
parser = new Parser();
items = new ArrayList();
weights = new ArrayList();
totalWeight = 0;
}
/**
* Create all the rooms and link their exits together.
*/
private void createRooms()
{
Room outside, theatre, pub, lab, office, up, down;
// create the rooms
outside = new Room("outside the main entrance of the university");
theatre = new Room("in a lecture theatre");
pub = new Room("in the campus pub");
lab = new Room("in a computing lab");
office = new Room("in the computing admin office");
up = new Room("creepy upstairs");
down = new Room("spooky downstairs");
// initialise room exits
outside.setExit("north", lab);
outside.item.addItem("notebok", 4);
outside.setExit("down", down);
outside.setExit("up", up);
outside.setExit("west", pub);
outside.setExit("east", office);
down.setExit("north", outside);
up.setExit("south", outside);
lab.setExit("east", office);
lab.setExit("south", outside);
lab.setExit("north", theatre);
office.setExit("south", lab);
pub.setExit("east", theatre);
pub.setExit("south", outside);
theatre.setExit("south", outside);
currentRoom = outside; // start game outside
}
/**
* Main play routine. Loops until end of play.
*/
public void play()
{
printWelcome();
// Enter the main command loop. Here we repeatedly read commands and
// execute them until the game is over.
boolean finished = false;
while (!finished)
{
Command command = parser.getCommand();
finished = processCommand(command);
}
System.out.println("Thank you for playing. Good bye.");
}
/**
* Print out the opening message for the player.
*/
private void printWelcome()
{
System.out.println();
System.out.println("Welcome to the World of Zuul!");
System.out.println("World of Zuul is a new, incredibly boring adventure game.");
System.out.println("Type 'help' if you need help.");
System.out.println();
System.out.println(currentRoom.getLongDescription());
}
我认为这是因为，名为“房间”的类没有对“项目”的任何引用，但是我不确定如何实现这一目标？任何指导将不胜感激。