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. Abstraction is one of the Object-Oriented programming key features. It allows us to hide the implementation complexities just by providing functionalities via simpler interfaces. In Java, we achieve abstraction by using either an interface or an abstract class. In this article, we’ll discuss when to use an interface and when to use an abstract clas... 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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