Customer - Tom want to buy Butter ( $ 20.00 ). Customer - Tom bought Eggs ! 17 : 52 : 28.705 INFO com. Customer - Tom want to buy Eggs ( $ 10.00 ). Customer - Tom didn ' t bought anything 17 : 52 : 28.699 INFO com. save () // show money balance and purchases after shopping tom. showBalance () // Tom can buy cheese now because he has enough money // and there is a discount on cheese because it expires in 2 days tom. showBalance () // return butter and get money back tom. showBalance () // trying to buy cheese, but receive a refusal // because he didn't have enough money tom. save () // show money balance of customer after each purchase tom. save () // create products var productDao = new ProductDaoImpl ( dataSource ) var eggs = Product.

Create data source and create the customers, products and purchases tables final var dataSource = createDataSource () deleteSchema ( dataSource ) createSchema ( dataSource ) // create customer var customerDao = new CustomerDaoImpl ( dataSource ) var tom = Customer. In the class App, we create a new instance of class Customer which represents customer Tom and handle data and actions of that customer and creating three products that Tom wants to buy. Here is the Product domain class with fields name, price, expirationDate which is specific for each product, productDao for working with DB, save method for saving product and getSalePrice method which return price for this product with public class Product We can use the domain model pattern and create classes Customer and Product where every single instance of that class incorporates both behavior and data and represents only one record in the underlying table. In the example of the e-commerce app, we need to deal with the domain logic of customers who want to buy products and return them if they want. The Domain Model is an object model of the domain that incorporates both behavior and data. These two are your domain-specific classes and each of that classes will include some business logic specific to its domain. It’s your Customer, and a Product the customer looks for. While analyzing requirements you will notice that there are few nouns you talk about repeatedly. Let's assume that we need to build an e-commerce web application. Instead of having one procedure that handles all business logic for a user action there are multiple objects and each of them handles a slice of domain logic that is relevant to it. Domain model pattern provides an object-oriented way of dealing with complicated logic.

Product builder java