How about using the Runnable interface instead  to run all the commands? In Java 8, you can now pass a method more easily using Lambda Expressions and Method References.
Imagine that in the same system, we had to sell Bonds too. This would be our receiver.Let us now implement our Action interface for each of the operations. Next, we'll try out the pattern again, only this time with Java 8 lambdas, reducing the verbosity of our code. The Order interface is a Functional interface and each ConcreteCommand above is really a function. This is our client code.If you have been with me till this point, you would be wondering where lambda expressions fit in all this. Create a request class. To the next. CheersI went over this website and I believe you have a lot of wonderful information, saved to my bookmarks Java 8 Lambda Expression for Design Patterns – Command Design PatternJava 8 Lambda Expression for Design Patterns – Command Design Pattern I noticed how much cleaner it was when using lambda's and a static interface method compared to using the 'old' pre-8 way of providing either concrete or anonymous interface implementations for all the commands. I have been looking at how to improve my knowledge of Design Patterns and at the same time sharpen my Java 8 skills too. Order.java. Typically, we would start with an interface which is used to apply an algorithm, and then implement it multiple times for each possible algorithm.

In some respects the command pattern is really just a poor man’s lambda expression to begin with. Command Design Pattern in Java 8 example. The process of buying/selling stocks is different from bonds. This can be implemented as macro functionality – that is, a series of operations that can be recorded and then run later as a single operation. The purpose of these examples is to show how some of the traditional Design Patterns can be applied using Lambdas expressions.Each example is accompanied by a short description of the examined pattern and a brief discussion demonstrating the differences between the implementation with and without the Lambda expressions. Do we really a class to represent each Command ? Quite recently I had to implement a command pattern in a project I was working on. It could affect the readability of the code a little bit but otherwise the use of Java 8 Lambdas really makes the implementation easy and powerful at the same time.Fill in your details below or click an icon to log in: 2. According to the GoF, Command design pattern states that encapsulate a request under an object as a command and pass it to invoker object. With the Broker and the Order interface, the system can easily be extended with minimal changes.We added 2 more classes BuyBond and SellBond which implement the Order interface. Broker object uses command pattern to identify which object will execute which command based on the type of command. Now simply running the macro will call each of the commands in turn. I have begun to realize that one can combine the two and also realized that Java 8 Lambdas are extremely powerful. The relationship between these participants is depicted below:Let’s look at a concrete example of the command pattern and see how it gets transformed with lambda expressions. I think that you should write more on this topic, it might not be a taboo subject but generally people are not enough to speak on such topics. This works as the Order interface has a method execute which takes no parameters and returns void. Create a command interface. Well, using Java 8 Lambdas, we don’t need the BuyBond or SellBond classes either.The Command pattern can be implemented easily using Lambdas. I have begun to realize that one can combine the two and also realized that Java 8 Lambdas are extremely powerful.In this post, we are going to take a look at how the implementation of the Command Design Pattern can be simplified using Java 8 Lambdas.The example we are going to refactor using Java 8 Lambdas is from In short , BuyStock and SellStock are 2 commands which implement the Order interface.

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