Strategy pattern allows choosing the best suited algorithm at runtime. This article describes the idea in brief with an example on how to implementation it in Java. Trang chủ Design pattern Hướng dẫn Java Design Pattern – Strategy. In the first example I’ll be using the Comparator and List interfaces. Hướng dẫn Java Design Pattern – Strategy. Design Patterns are already defined and provides industry standard approach to solve a recurring problem, so it saves time if we sensibly use the design pattern. A Strategy Pattern says that "defines a family of functionality, encapsulate each one, and make them interchangeable". This type of design pattern is a behavioral pattern. The strategy pattern is also called the policy pattern. In computer programming, the strategy pattern (also known as the policy pattern) is a behavioral software design pattern that enables selecting an algorithm at runtime. I.e. This allows clients to dynamically change sorting strategies including Quicksort, Shellsort, and Mergesort. SortStrategy.java This article explains strategy design pattern in Java with class diagrams and example code. The strategy pattern is a behavioral design pattern that enables selecting an algorithm at runtime — Wikipedia Đăng vào 03/01/2019 Được đăng bởi GP Coder 11679 Lượt xem. The strategy design pattern (also known as the policy design pattern) is a behavioral design pattern that allows us to select an algorithm at runtime. The Strategy Pattern is also known as Policy. Step 1: Create an interface. Strategy Pattern: Basic Idea. Có một vài trường hợp, các lớp chỉ khác nhau về hành vi của chúng. This is very similar to another design pattern, called the State design pattern. Example for Strategy Design Pattern Implementation. This real-world code demonstrates the Strategy pattern which encapsulates sorting algorithms in the form of sorting objects. Strategy Pattern Java Code Define a interface Strategy, which has one method processSpeeding () public interface Strategy { //defind a method for police to process speeding case. Overview. Introduction – Strategy Design Pattern is a behavioral design pattern among the Gang Of Four(GOF) Article on GOF Patterns & their types Design Patterns. It's one of the popular pattern in the field of object-oriented analysis and design along with Decorator, Observer and Factory patterns. the strategy design pattern deals with how the classes interact with each other. Sunday, July 9, 2017 Strategy Design Pattern and Open Closed Principle in Java - Example Strategy design pattern is based upon open closed design principle, the 'O' of famous SOLID design principles. Benefits: It provides a substitute to subclassing. As, we’ve a clear picture of the strategy design pattern, let’s look into two examples in which we’ll work with the Java APIs to create real world use cases to better understand this pattern. The strategy design pattern is one of the common patterns found in the Java API library. Programmatic Example Strategy Pattern. In the strategy mode, We create objects that represent various strategies and a context object whose behavior changes as the policy object changes. public void processSpeeding (int speed); } Now we have two kinds of police officers. The algorithms are interchangeable, meaning that they are substitutable for each other. Using design patterns promotes reusability that leads to more robust and highly maintainable code. Strategy pattern In the Strategy Pattern, the behavior of a class or its algorithm can be changed at runtime. The policy object changes the execution algorithm of the context object. 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