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Simple Factory Pattern Overview The Simple Factory Pattern decouples the client code from the object instantaition logic by centralizing creation inside a dedicated factory. The client requests objects from the factory instead of instantiating them directly, which improves maintainability and extensibility. A key limitation is that adding or mo ...

Aircraft Control System Scenario Consider an aircraft control system involving airplanes, control towers, and ground services. class Airplane { private ControlTower tower; private GroundService service; public Airplane(ControlTower t, GroundService g) { this.tower = t; this.service = g; } public void reques ...

Composite Pattern Overview The Composite Pattern, also known as the Part-Whole pattern, is a structural design pattern that allows treating individual objects and compositions of objects uniformly. It achieves this by defining a common interface for both leaf nodes (individual objects) and composite nodes (containers that hold other objects), e ...

Instantiating classes directly via constructors often couples client code tightly with concrete implementation details. This friction becomes pronounced when objects require multi-step configuration, validation, or conditional setup based on runtime parameters. Instead of scattering initialization logic across multiple consumer classes, central ...

The Decorator pattern enables the dynamic addition of behaviors to an individual object without altering its underlying structure or inheritance hierarchy. It provides a flexible alternative to subclassing by wrapping objects with decorator classes that perform additional tasks before or after delegating to the wrapped component. Architectural ...

Interfaces in Java serve as a contract that defines a set of abstract methods which implementing classes must concretize. Within the context of Android development, they are instrumental for decoupling components, facilitating interaction between disparate objects, and establishing clear structures for callbacks and event handling. By programmi ...

Pattern OverviewThe Chain of Responsibility (CoR) pattern is a behavioral design pattern that promotes loose coupling between a sender and a receiver. It accomplishes this by allowing a request to traverse a chain of potential handler objects. Each object in the chain is given an opportunity to process the request, either handling it completely ...

Behavioral Patterns Strategy Pattern Defines a family of algorithms, encapsulates each, and makes them interchangeable. Context uses a Strategy object to vary its behavior. Roles: Strategy: Interface declaring algorithm methods ConcreteStrategy: Implements specific algorithm Context: Maintains strategy reference Example: E-comerce Discounts i ...

In software development, there's a common philosophy: many problems can be solved by adding an intermediate layer. The Proxy pattern is a direct application of this concept. The Proxy pattern is defined as: **Provide a surrogate or placeholder for another object to control access to it.** This involves delegating a class to another class that ...

Direct Caching of Page Results The most straightforward approach to caching paginated data involves storing the complete result set for a specific page query. The cache key is typically constructed using the query parameters and pagination metadata. public List<Item> fetchItemList(String filter, int pageNum, int pageSize) { String ca ...