We have learnt already about how to implement Command and Observer patterns using Java 8 Lambda Expression. Now, we would look into Strategy Pattern. That’s why I would love to demonstrate a concrete example of command pattern using Java 8 Lambda Expression. import java… This is for a pattern; now, where does lambda expression fit in? While the Java 8 Predicate is a functional interface, there's nothing to stop a developer from using it in a traditional manner.Here's a Java Predicate example that simply creates a new class that extends the Predicate interface, along with a separate class that uses the Predicate in its main method:. In Monika Goel’s DZone article The Factory Pattern Using Lambda Expressions in Java 8 she describes a nice way of using Java 8 Lambdas to implement the factory pattern.. If design pattern is the structure of a human body, lambda expression can be used as the fluid (Java code) to run through its veins. We use Comparator to sort list of elements. The Factory Pattern Using Lambda Expressions in Java 8 The factory pattern is one of the best known patterns in Java. Due to the current inclusion of Java 8 Functional Programming Paradigm in today’s world, people still wonder how it could collaborate well with the existing object oriented approach. Strategy Pattern The Problem Domain. This page gives a simple example of Lambda implementation on Comparator usage. So, inject lambda in the code to implement old standard design patterns in a new way. Lambda expressions have changed the world in Java, and we can effectively use lambda expressions to avoid writing a lot of ceremonial code. This example is inspired from Neal Ford’s article on IBM Developer works: Functional Design Pattern-1. However, passing ‘magic strings’ as the type selector is not the approach I usually take. With Java-8, we can use Lambda to reduce multiple lines of … In the example using lambda expression, we avoided the use of class declaration for different strategies implementation and instead made use of the lambda expressions. I wanna talk about how patterns would change if we are using them with lambda expressions, well lambda expressions have changed the java remarkably, they give us light weight design tool. Comparator comes with one abstract method called compareTo(). Strategy Pattern: Another Example. Command Pattern The … In this post I would like to give an example or two on strategy pattern and then rewrite the same example using lambda expressions to be introduced in Java 8. More often I will define the types that … Java 8 Lambda Expression for Design Patterns – Strategy Design Pattern Posted on January 22, 2016 by gssachdeva The strategy pattern defines a family of algorithms encapsulated in a driver class usually known as Context and enables the algorithms to be interchangeable. Java 8 Lambda Expression for Design Patterns – Observer Design Pattern February 28, 2018 August 6, 2019 Gurpreet Sachdeva The Observer pattern is a behavioral design pattern and is helpful in determining the state of an object and get notified whenever there is any change. In this blog I would illustrate implementing the command pattern in functional programming style using Java 8 Lambda expressions.The intent of command pattern is to encapsulate a request as an object, thereby parameterizing clients with different requests, queue or log requests, and support corresponding … … Prior to Java-8, we use anonymous inner class implementation. 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