Web Reference: Jan 21, 2026 · Abstract classes and interfaces in Java are both used to achieve abstraction, but they serve different design purposes. While they may look similar at first glance, the way classes interact with them is fundamentally different. Mar 4, 2026 · This article discussed the overview of interfaces and abstract classes and the key differences between them. Also, we examined when to use each of them in our work to accomplish writing flexible and clean code. Dec 16, 2009 · "When inheriting an abstract class, the child class must define the abstract methods, whereas an interface can extend another interface and methods don't have to be defined."
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