LLD Object-Oriented Design: Interfaces & Abstract Classes (Designing Contracts)
The article discusses the importance of interfaces and abstract classes in object-oriented design, particularly in system design. It emphasizes how these concepts help define clear behavioral contracts between components, promoting loose coupling and flexibility. By understanding the distinctions and applications of interfaces and abstract classes, developers can create more scalable and maintainable systems.
- ▪Interfaces define capability contracts that implementing classes must follow.
- ▪Abstract classes provide partial implementation along with abstract behavior contracts.
- ▪Using interfaces and abstract classes enhances system scalability and testability.
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| Original publisher | DEV.to (Top) |
| Canonical URL | https://dev.to/saras_growth_space/lld-object-oriented-design-interfaces-abstract-classes-designing-contracts-138f |
| Publication time | Mon, 25 May 2026 15:00:00 +0000 |
| Retrieval time | 2026-05-25T15:07:38.108Z |
| Last seen | 2026-05-25T15:07:38.108Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | yEB4sUiRM_wI |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
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| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
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try { if(localStorage) { let currentUser = localStorage.getItem('current_user'); if (currentUser) { currentUser = JSON.parse(currentUser); if (currentUser.id === 3805711) { document.getElementById('article-show-container').classList.add('current-user-is-article-author'); } } } } catch (e) { console.error(e); } Saras Growth Space Posted on May 25 LLD Object-Oriented Design: Interfaces & Abstract Classes (Designing Contracts) #lld #systemdesign #codinginterview #softwareengineering System Design (15 Part Series) 1 LLD Foundations: What is System Design (and why it actually matters) 2 LLD Foundations: Understanding Requirements (the step most people skip) ... 11 more parts...
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