Let’s read about improving the quality, design, and maintainability of your Java applications by applying the five SOLID. principles of object-oriented design, principles that each professional Java developer should understand. We’re Going to Look at the Many Benefits of Writing SOLID code. We will also see how SOLID principles can help us transform an application
In the Visitor pattern, we employ a visitor class to alter the execution algorithm of an element class. This flexibility allows the element’s execution algorithm to adapt as the visitor changes. This pattern falls under the behavior pattern category. In accordance with this pattern, an element object must accept the visitor object, enabling the visitor
The Template Method is a behavioral design pattern that defines a blueprint for an algorithm in a superclass but allows specific steps of the algorithm to be overridden by subclasses without changing its core structure. Consider developing a data mining application that analyzes corporate documents in various formats (PDF, DOC, CSV) to extract meaningful data.
The Strategy pattern, also known as Policy is a design pattern that allows you to define a range of methods for achieving a specific task and place each method in its own class. These classes, known as strategies, are interchangeable, providing flexibility in algorithm selection without altering the core code. Imagine you’re developing a navigation
The State Pattern is a behavioral design pattern that allows an object to alter its behavior when its internal state changes. The pattern encapsulates states as separate classes and delegates the state-specific behavior to these classes. This makes it easy to add new states and modify the behavior of an object without altering its structure.
The Memento pattern also known as Token is a behavioral design concept that enables the preservation and retrieval of an object’s prior state discreetly, without exposing the details of its internal structure and implementation. Imagine creating a text editor app with an undo feature. To save states for undo, the app records object states before
The Mediator pattern, also known as the Intermediary or Controller, helps manage communication between different objects. It stops objects from talking to each other directly and makes them talk only through a mediator. This keeps things more organized and prevents messy connections between objects. In air traffic control systems multiple aircraft need to coordinate their
The Command Pattern, alternatively referred to as the Action or Transaction pattern, belongs to the category of behavioral design patterns. It involves the conversion of a request into an independent object that encapsulates all relevant information about the request. This transformation enables the passing of requests as method arguments, facilitates the postponement or queuing of
The Chain of Responsibility pattern is a design technique where you have a series of objects, like a chain, and each object can decide whether it can handle a request or should pass it along to the next object in the chain. It’s like a relay race where each runner decides if they can carry
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The Proxy pattern is a structural design pattern that allows an object (the proxy) to act as an intermediary or placeholder for another object, controlling access to it. It is often used to add a level of control or optimization to the interactions with the real object, such as lazy loading, access control, or logging.
