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Category: Java design patterns

  • Chain of Responsibility design pattern in Java

    Introduction The Chain of Responsibility (CoR) pattern is a behavioral design pattern that allows multiple objects to handle a request in a chain-like manner, where each handler processes the request or forwards it to the next handler in the chain. This pattern is commonly used in scenarios like event handling, middleware processing, logging frameworks, authentication,…

  • Bridge Design Pattern in Java

    Introduction The Bridge Design Pattern is a structural pattern that is used to decouple an abstraction from its implementation, so that both can evolve independently. This pattern is particularly useful when designing applications that require multiple variations of an abstraction and its implementation, without leading to a combinatorial explosion of subclasses. By using the bridge…

  • Composite pattern in Java

    Introduction The Composite design pattern is a structural pattern used to treat individual objects and compositions of objects uniformly. It enables you to represent part-whole hierarchies, making it easier to work with tree-like structures. In this tutorial, we will explore the Composite pattern in Java with a detailed example and explanation. Key Concepts of Composite…

  • Flyweight pattern in Java

    Introduction A flyweight is a shared object that can be used in multiple contexts simultaneously. The flyweight acts as an independent object in each context – it’s indistinguishable from an instance of the object that’s not shared. Flyweights cannot make assumptions about the context in which they operate. When you consider flyweight pattern, you need…

  • Facade Pattern in Java

    Introduction Provide a unified interface to a set of interfaces in a subsystem. Facade defines a higher-level interface that makes the subsystem easier to use. Imagine a scenario where a system involves numerous objects collaborating to perform a series of tasks. Interacting directly with each object individually can be cumbersome and error-prone. A Facade acts…

  • Adapter Pattern

    Introduction The Adapter Design Pattern is a structural design pattern that allows objects with incompatible interfaces to work together. Convert the interface of a class into another interface that clients expect. Adapter lets classes work together that could not otherwise because of incompatible interfaces. This design pattern acts as a bridge between two incompatible interfaces,…

  • Decorator pattern in Java

    Introduction Attach additional responsibilities to an object dynamically. Decorators provide a flexible alternative to subclassing for extending functionality. The Decorator Pattern is a structural design pattern that allows you to dynamically add behavior or responsibilities to an object without altering its structure. It is an alternative to subclassing and is often used to adhere to…

  • Builder design pattern in Java

    1. Introduction The Builder Design Pattern is a Creational Design Pattern that provides a step-by-step approach to constructing complex objects. Instead of directly instantiating the object, the pattern separates the construction logic from the representation, allowing developers to create objects in a controlled, flexible, and readable manner. 2. Why use the builder design pattern? 3.…

  • Prototype design pattern in Java

    1. Introduction It specifies the kinds of objects to create using a prototypical instance and creates new objects by copying this prototype. This pattern offers an alternative approach to creating new objects by duplicating or cloning an existing instance, rather than building a new one from scratch. This allows you to bypass the overhead associated…

  • Abstract Factory Design Pattern in Java

    1. Introduction It provides an interface for creating families of related or dependent objects without specifying their concrete classes. An abstract factory is essentially a factory of factories. This design pattern encapsulates a collection of related factories that share a common theme. Instead of instantiating individual product classes directly, you create a specific concrete factory,…