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The Adapter Pattern in Java 1. Overview In this quick tutorial, we’ll have a look at the Adapter pattern and its Java implementation. 2. Adapter Pattern An Adapter pattern acts as a connector between two incompatible interfaces that otherwise cannot be connected directly. An Adapter wraps an existing class with… Continue Reading java-adapter-pattern
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Delegation Pattern in Kotlin 1. Overview There are many use cases in which delegation is preferred to inheritance. Kotlin has great language-level support for this. In this tutorial, we’ll talk about Kotlin’s native support for the delegation pattern and see it in action. 2. Implementation First, let’s assume we have… Continue Reading kotlin-delegation-pattern
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Composite Design pattern in Java 1. Introduction In this quick tutorial, we’ll introduce the composite design pattern in Java. We’re going to describe the structure and the purpose of its use. 2. The Structure The composite pattern is meant to allow treating individual objects and compositions of objects, or “composites” in… Continue Reading java-composite-pattern
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The Observer Pattern in Java 1. Overview In this article, we’re going to describe the Observer pattern and take a look at a few Java implementation alternatives. 2. What is the Observer Pattern? Observer is a behavioral design pattern. It specifies communication between objects: observable and observers. An observable is… Continue Reading java-observer-pattern
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Lombok @Builder with Inheritance 1. Overview The Lombok library provides a great way to implement the Builder Pattern without writing any boilerplate code: the @Builder annotation. In this short tutorial, we’re specifically going to learn how to deal with the @Builder annotation when inheritance is involved. We will demonstrate two techniques.… Continue Reading lombok-builder-inheritance
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A Guide to the Front Controller Pattern in Java 1. Overview In this tutorial we’ll be digging deeper into the Front Controller Pattern, part of the Enterprise Patterns as defined in Martin Fowler‘s book “Patterns of Enterprise Application Architecture”. Front Controller is defined as “a controller that handles all requests… Continue Reading java-front-controller-pattern
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Service Locator Pattern 1. Introduction In this tutorial, we’re going to learn about the Service Locator design pattern in Java. We’ll describe the concept, implement an example and highlight the pros and cons of its use. 2. Understanding the Pattern The purpose of the Service Locator pattern is to return… Continue Reading java-service-locator-pattern
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The Proxy Pattern in Java 1. Overview The Proxy pattern allows us to create an intermediary that acts as an interface to another resource, while also hiding the underlying complexity of the component. 2. Proxy Pattern Example Consider a heavy Java object (like a JDBC connection or a SessionFactory) that… Continue Reading java-proxy-pattern
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Creational Design Patterns in Kotlin: Builder 1. Introduction In this quick article, we’ll see how to implement the Builder Design Pattern in Kotlin. 2. Builder Pattern The Builder pattern is the one that people often use but rarely create on their own. It’s great to handle the building of objects… Continue Reading kotlin-builder-pattern
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Flyweight Pattern in Java 1. Overview In this article, we’ll take a look at the flyweight design pattern. This pattern is used to reduce the memory footprint. It can also improve performance in applications where object instantiation is expensive. Simply put, the flyweight pattern is based on a factory which… Continue Reading java-flyweight
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