--- title: Design Pattern Combination – Strategy with Factory Method description: Design Pattern Combination – Strategy with Factory Method image: https://blog.e-zest.com/hs-fs/file-3586008885-png/blog-files/strategy-design-pattern.png --- [![e-Zest logo\_An accion lab company\_Colour](https://blog.e-zest.com/hubfs/images/Logos%20with%20Tagline/Corporate/SVG/e-Zest%20logo_An%20accion%20lab%20company_Colour.svg "e-Zest logo_An accion lab company_Colour")](https://www.e-zest.com/) - [WORK](https://www.e-zest.com/our-work) - [SERVICES](https://www.e-zest.com/our-services) - [Product Engineering](https://www.e-zest.com/digital-product-engineering-services) - [Enterprise Data Services](https://www.e-zest.com/enterprise-data-services) - [Digital Commerce](https://www.e-zest.com/digital-commerce-services) - [Digital Operations](https://www.e-zest.com/digital-operations) - [Digital Consulting](https://www.e-zest.com/digital-transformation-consulting-services) - [Digital Experience Design](https://www.e-zest.com/digital-experience-design) - [INSIGHTS](https://blog.e-zest.com/) - [CAREERS](https://www.e-zest.com/careers) - [ENTERPRISE DATA SERVICES](https://www.e-zest.com/enterprise-data-services) - [GENERATIVE AI](https://www.e-zest.com/generative-ai) - [Healthcare](https://healthcare.e-zest.com) - [Contact Us](https://www.e-zest.com/contact-us) - ![Elevating Product Engineering with AI and ML](https://blog.e-zest.com/hubfs/Elevating%20Product%20Engineering%20with%20AI%20and%20ML.jpg) [BLOGS](https://blog.e-zest.com) #### Elevating Product Engineering with AI and ML As technology evolves and customer choices broaden, there is an increasing ... 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Though we have a catalog of design patterns such as Gang of Four (GoF), we do not have a formal specification which mandates the use of such a design pattern along with its related pattern. In this blog, I’m going to write about one such design pattern – Strategy. It is always useful to implement Strategy along with Factory Method. Both Strategy and Factory Method are Gang of Four (GoF) design patterns. Strategy design pattern allows selection of an algorithm’s behaviour during runtime. An example of Strategy is shown in Figure 1. \[imageframe style="border" bordercolor="" bordersize="4px" stylecolor="" align=""\] [![Strategy design pattern](https://blog.e-zest.com/hs-fs/file-3586008885-png/blog-files/strategy-design-pattern.png?width=567&height=239&name=strategy-design-pattern.png)](https://blog.e-zest.com/wp-content/uploads/2013/08/Strategy-design-pattern.png) \[/imageframe\] Figure 1. Strategy design pattern The DocumentExtractor class will need a code shown in Listing 1 to call the appropriate implementation of StatementExtractor based on the type of document. ``` StatementExtractor extractor = null; if(type.equals(“BankAccountStatement”)) { extractor = new BankAccountStatementExtractor(); } else if(type.equals(“CreditCardStatement”)) { extractor = new CreditCardStatementExtractor(); } extractor.extract(statement); ``` Listing 1. Call the appropriate implementation based on document type When a Strategy design pattern is implemented, such code to use the appropriate implementation class is always required. Instead of embedding this code directly in the class which calls the algorithm, a better approach is to decouple this code into another class which implements Factory method. Thus, the design in Figure 1 can be modified by adding the Factory method design pattern as shown in Figure 2. [![Strategy with Factory Method design pattern](https://blog.e-zest.com/hs-fs/file-3586008895-png/blog-files/strategy-with-factory-method-design-pattern.png?width=633&height=220&name=strategy-with-factory-method-design-pattern.png)](https://blog.e-zest.com/wp-content/uploads/2013/08/Strategy-with-Factory-Method-design-pattern.png) Figure 2. Strategy with Factory Method design pattern The code to use the appropriate implementation of StatementExtractor based on document type is now present in StatementExtractorFactory as shown in Listing 2. The factory class is used by DocumentExtractor as shown in Listing 3. ``` public class StatementExtractorFactory { private static Map extractors = new HashMap<>(); static { extractors.put(“BankAccountStatement”, new BankAccountStatementExtractor()); extractors.put(“CreditCardStatement”, new CreditCardStatementExtractor()); } public static StatementExtractor getInstance(String type) { return extractors.get(type); } } ``` Listing 2. StatementExtractorFactory ``` public class DocumentExtractor { public void extractDocument() { … StatementExtractor extractor = StatementExtractorFactory.getInstance(type); extractor.extract(statement); … } } ``` Listing 3. DocumentExtractor A Factory class can create new instances in a multithreaded application. Thus, the Strategy design pattern should always be implemented with Factory Method design pattern. - - - ### Similar Blog [![How to Create Own Custom JMeter Template?](https://blog.e-zest.com/hubfs/How%20to%20Create%20Own%20Custom%20JMeter%20Template%201280x667%202560x1334.jpg) How to Create Own Custom JMeter Template? We frequently need to construct Test Plans with a similar format when working on web application performance testing using Apache ... 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