Web Reference: Oct 21, 2025 · In Java, classes and interfaces are used to define the structure and behavior of programs. While they might seem similar, since both can hold methods and variables, they have very different purposes. Use abstract classes for "is-a" relationships with shared fields, and interfaces for "can-do" contracts across unrelated classes. When in doubt, start with an interface - you can always extract an abstract class later if shared state emerges. This article explains abstract class vs interface in C# with simple examples, real-world use cases, and a clear comparison table. What is an Abstract Class in C#?
YouTube Excerpt: Video Content: ---------------------------------- 0:00 - Intro 1:12 - Pseudocode Problem 2:39 - Inheritance Solution 4:21 -
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