Hjælp med en opgave.

Her er den klasse jeg ikke kan få til at virke:
import java.util.*;
/**
* Room laver et rum, med forbindelse til andre rum
* - kan indeholde genstande og besøgende.
*/
public class Room
{

//Fields
    private List rooms;
    private ArrayList items;
    private String name;
    private Random randomGenerator=new Random();
   
//Constructor.
    /**
    * rooms is a list of length 4 where
    *  rooms.get(0) refers to the room in direction EAST
    *  rooms.get(1) refers to the room in direction NORTH
    *  rooms.get(2) refers to the room in direction WEST
    *  rooms.get(3) refers to the room in direction SOUTH
    */

    public Room(String name)
        {rooms = new ArrayList(4);
      for (int i = 0; i < 4; i++)
        {rooms.add(i, null);}
   
    items = new ArrayList();
      this.name = name;
        }
//Method
    public void connectTo(int dir, Room r)
        {rooms.set(dir, r);}
//Method
    public boolean roomExists(int dir) {
        return rooms.get(dir) != null;
    }
//Method
    public Room leadTo(int dir)
        {return (Room)rooms.get(dir);}
//Method
    public void addItem(Item i)
        {items.add(i);}
//Method
    public boolean itemExists()
      {
        if (items.size()>0) {
            return true;
            }
            else {
                return false;
                }
    }
//Method
    public Item chooseItem()
        {int itemsSize = items.size(); 
        int p = randomGenerator.nextInt();
          return (Item) items.get(itemsSize);
        }
//Method
    public void removeItem(Item i)
      {System.out.println(items.remove(i) + " has been removed");}

//Den Nye Metode
    public void roomContains(Item i);
    {if(location.roomContains()== true){
        System.out.println("The Item is in the Room.");
    }}
   
//Method 
    public String toString()
        {return this.name;}
     
}

Den er så i sammenhæng med en Item-klasse og en Visitorklasse.