Mini-Commerce (Console) – Design Patterns em Java

Projeto didático demonstrando Builder, Strategy, Factory Method, Decorator, Observer, Template Method e Singleton em um fluxo simples de e-commerce.

Rodar

mvn -q -DskipTests=true clean package
# Executar (se tiver o exec plugin configurado) ou rodar com java -cp
# mvn -q exec:java -Dexec.mainClass="com.example.minicommerce.Main"
java -cp target/mini-commerce-1.0.0.jar com.example.minicommerce.Main

Padrões e onde aparecem

• Builder: OrderBuilder, ProductBuilder
• Strategy: DiscountStrategy (NoDiscount, StudentDiscount, BlackFridayDiscount)
• Factory Method: PaymentProcessorFactory → PixProcessor, CreditCardProcessor
• Decorator: OrderCost + GiftWrap, ExpressShipping
• Observer: Inventory + LowStockListener, SalesDashboardListener
• Template Method: FulfillmentTemplate → StandardFulfillment, FragileFulfillment
• Singleton: AppConfig, AppLogger

Extensões sugeridas

• CouponDiscount (Strategy), Insurance (Decorator), BoletoProcessor (Factory)
• Alternar para FragileFulfillment (Template)