public String getItemsString() {
        if (items.isEmpty()) {
            return "The room doesn't seem to contain anything of interest.";
        }
        String itemsString = "Items of interest: ";
        for (String key : items.keySet()) {
            itemsString += key + "; ";
        }
        itemsString = itemsString.substring(0, itemsString.length()-2) + ".";
        return itemsString;
    }