@Override
  public String toString() {
    return "Product:" +
        "id:" + id +
        ", name:'" + name + '\'' +
        ", defaultPrice:" + defaultPrice +
        ", productCategory:" + productCategory +
        ", supplier:" + supplier +
        ", productList:" + productList;
  }

/**
* id : Integer
* name : String
* defaultPrice: Float
* productCategory : ProductCategory
* supplier : Supplier
* productList : ProductList
  */