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Introduction If you've worked with frameworks like Mybatis, you're likely familiar with the following pattern: first creating a builder object, then calling the .build() method: InputStream is = Resources.getResourceAsStream("mybatis.xml"); SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is); SqlSession sqlS ...

Introduction to Factory Design Patterns Factory patterns are creational design patterns that provide an interface for creating objects while allowing subclasses to determine which class to instantiate. This approach delegates object instantiation to subclasses, enabling client code to be decoupled from specific concrete classes without requirin ...

Certain objects within a software system, such as application settings, should ideally have only one instance. Creating multiple instances leads to unnecessary memory consumption and resource waste. The following example demonstrates a standard configuration loader without singleton constraints. Properties File (app.settings): apiKey = XYZ123 m ...

Creational PatternsSingleton PatternThe Singleton pattern ensures that a class has only one instance and provides a global access point to it. This pattern is useful for managing shared resources like database connections, configuration settings, or logging services.Benefits and DrawbacksBenefits include controlled access to the sole instance, ...

Abstract Factory Pattern The Abstract Factory pattern provides an interface for creating families of related or dependent objects without specifying their concrete classes. This pattern is particularly useful when a system needs to be independent of how its products are created, composed, and represented. Consider a scenario where we're build ...

Design patterns are typical solutions to common problems in software design. They represent best practices used by experienced object-oriented software developers. Categories of Design Patterns Creational Patterns These patterns abstract the instantiation process, focusing on how objects are created in a flexible and reusable manner. Factory M ...

Instantiation logic often becomes tightly coupled with business requirements when objects are created directly using the new keyword. Modifying these dependencies later requires widespread code changes, violating the Open/Closed Principle. Creational design patterns abstract the object creation process, centralizing initialization logic and enh ...

The Builder Pattern The Builder pattern is a creational design pattern aimed at constructing complex objects step by step. It enables the creation process to be independent of the representation, allowing the same construction logic to produce different results. Unlike simple factories that provide an object directly, the Builder patttern focus ...