public interface OrderService {
 
    OrderAck submitOrder(Order order);
 
}
 
public class Order implements Serializable {
 
    private String orderId;
    private String itemId;
    private int quantity = 1;
 
    public String getOrderId() {
        return orderId;
    }
 
    public void setOrderId(String orderId) {
        this.orderId = orderId;
    }
 
    public String getItemId() {
        return itemId;
    }
 
    public void setItemId(String itemId) {
        this.itemId = itemId;
    }
 
    public int getQuantity() {
        return quantity;
    }
 
    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }
}