Orders using a Map

gistfile1.java

public class SomePlugin extends JavaPlugin {
  private Map<String, Order> orders;

  ...

  public void onEnable() {
    //you'll need to remember to load the config from disk
    //something like
    //this.orders = getConfig().getMap("Amazon.Players");
    this.orders = new HashMap<String, Order>;
    ...
  }

  //call this method whenever you need to add orders
  public void addOrder(String playerName, Material item, int quantity) {
    orders.put(playerName, new Order(item, quantity));
  }

  public void onDisable() {
    getConfig().set("Amazon.Players", orders);
    saveConfig();
  }
}

public class Order implements ConfigurationSerializable {
  private int count;
  private Material item;

  public Order(Material i, int c) {
    this.count = c;
    this.item = i;
  }

  //add getters and setters  if you need them

  public Map<String, Object> serialize() {
    Map ret = new HashMap<String, Object>();
    ret.put("item", item.toString());
    ret.put("count", count);
    return ret;
  }

  public static Order deserialize(Map<String, Object> input) {
    return new Order(
                     Material.matchMaterial((String) input.get("item")), 
                     (Integer) input.get("count")
                    );
  }
}