--- title: Medium | daily.dev description: A ground-up walkthrough of the Strategy Pattern using a vehicle simulation example in Java. Starting from a rigid inheritance-based design, the post... canonical: https://daily.dev/posts/medium-dufuaz981 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Medium | daily.dev og:description: A ground-up walkthrough of the Strategy Pattern using a vehicle simulation example in Java. Starting from a rigid inheritance-based design, the post... og:url: https://daily.dev/posts/medium-dufuaz981 og:image: https://api.daily.dev/og/posts/DUFUAZ981.png og:image:alt: Medium og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Medium **[Medium](https://daily.dev/sources/medium_js)** · 9 min read · 0 upvotes · 0 comments ## Summary A ground-up walkthrough of the Strategy Pattern using a vehicle simulation example in Java. Starting from a rigid inheritance-based design, the post demonstrates three core design principles: separating what varies from what stays the same, programming to an interface rather than an implementation, and favoring composition over inheritance. Each principle is illustrated with concrete before/after code, showing how extracting engine-start behavior into a swappable interface eliminates duplication, enables runtime behavior swapping, and keeps classes open for extension without modification. The post concludes by mapping the formal Head First Design Patterns definition onto the example phrase by phrase. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Polymorphism with Strategies](https://daily.dev/posts/polymorphism-with-strategies-pzrzruoku) · RUBYLAND · 0 upvotes · 0 comments - [Strategy Pattern: Choosing Without Attachment](https://daily.dev/posts/strategy-pattern-choosing-without-attachment-zu1wbnbfs) · We Are .NET · 0 upvotes · 0 comments - [Design Patterns Suck](https://daily.dev/posts/design-patterns-suck-kei3cx9df) · iamluminousmen · 1 upvotes · 0 comments - [The Composite Design Pattern: How to Work with Individual Objects and Groups Through the Same Interface](https://daily.dev/posts/the-composite-design-pattern-how-to-work-with-individual-objects-and-groups-through-the-same-interf-6lvojd7t9) · freeCodeCamp · 0 upvotes · 0 comments - [The Command Pattern in Java: Eliminating Fat Service Classes with Commands and Handlers](https://daily.dev/posts/the-command-pattern-in-java-eliminating-fat-service-classes-with-commands-and-handlers-ekqpbr97g) · Sergio Lema · 1 upvotes · 0 comments --- Tags: [#general-programming](https://daily.dev/tags/general-programming), [#java](https://daily.dev/tags/java), [#design-patterns](https://daily.dev/tags/design-patterns) [View this post on daily.dev](https://daily.dev/posts/medium-dufuaz981) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Medium","url":"https://daily.dev/posts/medium-dufuaz981","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/medium-dufuaz981"},"datePublished":"2026-07-22T14:34:47.962Z","dateModified":"2026-07-22T14:36:18.917Z","description":"A ground-up walkthrough of the Strategy Pattern using a vehicle simulation example in Java. 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