Strategy Blueprint Pattern Inwards Coffee Using Enum - Tutorial Example

Hello guys, how are yous doing? I promise yous all are fine too doing skilful inwards your life too career. Today, I am going to speak nearly the Strategy pattern, i of the useful pattern too coding pattern which volition assist yous to write flexible code. The code which tin withstand the attempt of fourth dimension inwards Production. I'll too learn yous how yous tin usage Enum to implement the Strategy pattern pattern too Open Closed pattern regulation ameliorate inwards Java. I lead maintain said this before that Java Enum is rattling versatile too tin practise lot to a greater extent than than yous unremarkably expression from it. We lead maintain seen a lot of examples of Enum inwards my before posts like writing thread-safe Singleton using Enum too 10 ways to usage Enum inwards Java.

In this article, nosotros volition larn a novel way to usage Enum, for implementing the Strategy pattern pattern. Strategy pattern is i of the famous pattern, which takes payoff of polymorphism, to withdraw switch cases too strive for the open-closed pattern principle.

Formally it encapsulates related algorithm, known every bit strategy too brand them interchangeable. So your Client, too known every bit Context, tin usage a unlike algorithm or strategy, without whatever modification.

One of the commutation advantages of Strategy pattern is it's extensibility, similar introducing a novel Strategy is every bit slow every bit writing a novel shape too implementing Strategy interface, amongst Enum, instead of creating a carve upward class, yous practise a carve upward Enum instance, which way less divulge of classes too amount practise goodness if Strategy pattern.

Btw, if yous are novel into the basis of pattern pattern too hence I advise yous larn to a greater extent than of them. They non solely assist yous to solve mutual coding problems but too helps yous to write ameliorate too flexible code. If yous desire around assist inwards learning them, Java Design Patterns - The Complete Masterclass can hold upward used every bit a companion. It's i of the ameliorate course of report on Udemy on this topic.

UML diagram of the Strategy Design Pattern

Here is the UML diagram of Strategy pattern inwards Java, Why yous should depict UML diagram? because this is the best way to squall upward too sympathize how a pattern pattern works. In fact, this is the criterion ways to communicate your pattern to your boyfriend developers too squad members.

In this diagram, I lead maintain explained the strategy pattern pattern using sorting algorithm like Bubble Sort, QuickSort, Insertion Sort, and Merge Sort. For our code example, yous tin supervene upon Strategy interface amongst Match, too sorting strategy to T20, OneDay too Test Matches.

How to implement a Strategy pattern using Enum inwards Java

In this tutorial, nosotros volition come across an illustration of implementing a Strategy pattern using Java Enum, I would usage a sporting example. If yous are a cricket fan, similar me, yous are going to connect amongst this article, but if yous are a Soccer or Tennis fan than allow me explicate a fleck nearly the example.

In Cricket, in that place are 3 pop formats T20 (20 over match), One day(50 over match) too Test(5 days match). If a player, plays all 3 format, he needs to conform its batting strategy to hold upward effective.

For example, T20 is all nearly scoring quickly, piece One-day international games ambit a fleck of fourth dimension for setting too and hence scoring. In contrast of shorter version, Test fit is all nearly grinding i.e. occupying the flexure too making certain your opponent gets tired, before scoring briskly.

In our Strategy pattern example, nosotros lead maintain used an Enum to define unlike batting strategy. We lead maintain defined a default play() method too since Enum tin override methods, nosotros are overriding it on every instance i.e. on T20, ONE_DAY, too TEST.

Our context class, which is named every bit Player too has a play() method, which delegates to play() method of configurable Strategy.  Btw, if yous are non familiar amongst Enum inwards Java too it's essential features similar overriding methods, I advise yous bring together The Complete Java Masterclass course of report on Udemy. It's i of the most up-to-date course of report to larn Java too latterly updated to comprehend the latest Java version every bit well.

Strategy Pattern Example using Enum

Here is amount code illustration of implementing Strategy pattern pattern using Enum inwards Java. If yous are coding inwards Eclipse IDE too hence yous don't ask to practise much, merely select too re-create this code, select the Java projection yous are working inwards Eclipse IDE too glue it.

Eclipse volition lead maintain attention of creating the correct packages too source file amongst a proper get upward similar the get upward of a pa world class.

This is the quickest way to endeavor too execute Java code snippet from the meshing inwards your IDE. Also remember, the Strategy pattern is a skilful illustration of Open Closed Design Principle of Enum, yous non solely reduced the divulge of classes but too achieves extensibility too flexibility of Strategy pattern. On the downside, Yes, yous ask to modify your tried too tested Enum every time, though past times inserting solely novel code, it notwithstanding violates Open Closed regulation a bit, which advocates that novel functionality should hold upward added past times writing novel code, rather than modifying existing code.


Further Learning
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What is the deviation betwixt Factory too Abstract Factory pattern Patterns? (answer)

What is the deviation betwixt State too Strategy Pattern inwards Java? (answer)

How to implement the Strategy Design Pattern using Java Enum? (solution)

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Thanks for reading this article hence far. If yous similar this article nearly Factory pattern pattern too Dependency Injection pattern inwards Java too hence delight portion amongst your friends too colleagues. If yous lead maintain whatever questions or feedback too hence delight drib a note.

P. S. - If yous are looking for around costless course of report to initiative of all learning pattern patterns, in that place is a skilful i on Udemy called Java Design Patterns too Architecture past times John Purcell. It doesn't comprehend all the GOF patterns but still, it's skilful to larn all the of import ones too architectures similar MVC.

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