This article explains how to design a Java service that selects the appropriate coupon grant type based on resource type and ID, comparing traditional switch/if‑else, the Strategy pattern, and a concise Map‑lambda approach while showing code examples and trade‑offs.
This article introduces six classic design patterns—Strategy, Chain of Responsibility, Template Method, Observer, Factory, and Singleton—explaining their real‑world business scenarios, core principles, and providing clean Java implementations to help developers write more maintainable and extensible code.
This article explains the differences and similarities between the Factory and Strategy design patterns in Java, provides concrete code examples for each, and discusses how the Strategy pattern can offer more flexible behavior composition compared to the traditional Factory approach.
This article explains the Strategy Design Pattern, a behavioral design pattern that enables defining a family of algorithms, encapsulating each one, and making them interchangeable to improve code maintainability and flexibility in software development.
The Vivo Internet Server Team demonstrates how applying classic design patterns—factory, template method, strategy, and state—alongside finite‑state machines or workflow engines can dramatically improve the scalability, maintainability, and extensibility of a visual marketing automation engine for rapidly changing business scenarios.
This article walks through a real‑world multi‑app scenario, breaks down the core challenges, compares several implementation approaches—including naive if‑else, SDK abstraction, and the Strategy design pattern—and reflects on engineering trade‑offs to help front‑end engineers write cleaner, more maintainable code.
This article demonstrates how to replace complex if‑elseif logic with the Strategy pattern combined with simple and reflection‑based factories in a Spring Boot application, enabling clean, extensible handling of multiple advertising page types.
This article explains how to replace bulky if‑else statements with a clean, annotation‑based Strategy pattern in a Spring Boot application, covering interface definition, custom annotations, dynamic proxy handling, map injection, and the crucial hashCode/equals overrides for reliable handler lookup.
This article introduces the Strategy design pattern, explains its definition, class diagram, Java implementation examples, advantages and disadvantages, and demonstrates its use in JDK components such as Comparator and ThreadPoolExecutor, helping developers replace complex if‑else logic with interchangeable algorithm objects.
This article walks through creating a simple native Node.js HTTP server, applying the Strategy pattern to decouple routes, enforcing the DRY principle with Promises, and then dives deep into Koa’s core source—including its constructor, use, listen, compose, and router modules—to reveal how the framework orchestrates middleware and request handling.
This article explains how to replace cumbersome if/else payment handling code with a clean Strategy pattern implementation in Java, showing both the problem scenario and a complete example including enums, interfaces, and concrete payment classes for Alipay and WeChat Pay.
This article demonstrates how to replace traditional if‑else structures with guard clauses, Java Optional, and various strategy pattern implementations—including polymorphic classes, static maps, Spring‑managed beans, enums, and functional lambdas—to produce clearer, more maintainable code.
This article demonstrates how to replace cumbersome if‑else or switch statements in Java backend receipt processing by applying the Strategy pattern with a Map dictionary, a simple factory, and the Chain of Responsibility pattern, while also showing reflective class loading for extensibility.
This article explains the Strategy (Policy) pattern, detailing its definition, class diagram, typical use cases, advantages and drawbacks, compares it with Factory and State patterns, and provides a practical Java implementation with sample code and analysis of related JDK components.
This article demonstrates how Spring's @Autowired annotation can inject arrays, lists, sets, and maps of beans, shows code examples for retrieving all PayService implementations, and explains how to combine this feature with the strategy pattern to route payment channels dynamically.
This article explains the Strategy pattern with Java, showing how to refactor a naïve pricing module into a flexible, open‑closed design, and then extends the concept to payment processing and thread‑pool rejection handling, complete with code samples and UML diagrams.
This article explains the Strategy design pattern, demonstrates its use through a quote‑management example and various Java implementations, discusses the open‑closed principle, shows how to apply the pattern to different scenarios such as payment processing and thread‑pool rejection handling, and outlines its advantages and drawbacks.
To refactor a versioned API plagued by nested guards, the article proposes the Responsibility Tree pattern—a hybrid of Chain of Responsibility and Strategy—that routes requests through hierarchical handlers based on parameters, yielding cleaner code, easier debugging, and scalable extension for future versions.
This article explains how to replace repetitive if‑else rule checks in PHP with a generic rule module using the Strategy design pattern and reflection, providing step‑by‑step code examples, architectural diagrams, and a clear path to extend rules without modifying client code.
The Meituan Takeaway Marketing team shows how combining domain‑driven design with classic patterns such as Factory Method, Strategy, State and Responsibility Chain creates an extensible, maintainable reward system that adapts to rapidly changing business rules while keeping the domain model clean and SOLID‑compliant.
This article systematically introduces a finite state machine (FSM) based solution for managing advertisement status in the LEGO advertising platform, detailing the background challenges, problem review, two design alternatives (strategy‑factory pattern and configuration‑driven approach), their advantages, disadvantages, and a final recommendation.
This article explains the Strategy design pattern, its definition, roles, UML diagram, Java code examples, real‑world applications such as payment integration and compression, and provides guidance on when to use it, its advantages, drawbacks, and how to simplify it with Java 8 lambdas.
This article shows how to replace tangled if/else permission checks in a Java backend by using enums, a factory class, and the strategy pattern, resulting in cleaner, more extensible code that follows the open‑closed principle.
This article explains how to replace tangled if‑else statements in business code with the Strategy and Factory design patterns, demonstrates their implementation in Java and Spring, and shows how to register strategy beans to improve readability and maintainability.
This article explains how excessive if‑else statements in business code hurt readability and maintainability, and demonstrates how to replace them with the Strategy and Factory design patterns integrated with Spring, using a food‑delivery discount example and complete Java code snippets.
This article explains how to replace tangled if‑else logic in business code with the Strategy and Factory design patterns, integrates them into a Spring application, and demonstrates the resulting improvements in readability, maintainability, and extensibility for discount calculations.
This article explains how to apply the Strategy pattern within a Spring project, covering background, learning objectives, step‑by‑step code examples for query services A, B, and C, the three‑part invocation process, and both list‑based and map‑based configurations.
This article demonstrates how to replace cumbersome if‑else logic in an order‑processing system with a concise Strategy pattern implementation, using a custom @HandlerType annotation and Spring bean registration to make adding new order types effortless and maintainable.
This tutorial walks you through the background, learning goals, and detailed Spring-based code examples of the Strategy pattern, including list and map implementations, configuration files, and a complete run‑time demonstration for Java developers.
