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Domain-Driven Design - Complete Guide

Domain-Driven Design offers a powerful approach to software development by deeply embedding business knowledge within the code itself.

mysimulator teamUpdated June 2026≈ 3 min read▶ Open the simulation

Building Complex Software with Domain Expertise

Domain-Driven Design (DDD) is a software development approach introduced by Eric Evans that focuses on creating software that reflects a deep understanding of the business domain.

DD emphasizes collaboration between technical and domain experts, using a shared language (Ubiquitous Language) and organizing code around domain concepts rather than technical infrastructure.

// Value Object - defined by attributes

private BigDecimal amount;

private Currency currency;

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throw new IllegalStateException("Cannot modify shipped order");

items.add(new OrderItem(productId, quantity, price));

if (!canBeShipped()) {

Frequently asked questions

What is Domain-Driven Design?

void save(Order order);

What does 'Ubiquitous Language' refer to in Domain-Driven Design?

List findByCustomerId(CustomerId custome?

Where would you typically implement database interactions in DDD?

// Implementation in infrastructure layer

What is the purpose of the JpaOrderRepository class?

class JpaOrderRepository implements OrderRepository {

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