Web Reference: Mar 4, 2026 · 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 class while designing applications. Abstract class or interface? Most Java devs get this wrong. Here's a clear breakdown with a side-by-side comparison table, code examples, and a simple decision rule. Jan 21, 2026 · The diagram above clearly illustrates this difference: Depiction of Abstract class and Interface Abstract Class An abstract class is a class that cannot be instantiated directly. It acts as a base class for other related classes and can contain both abstract and concrete methods. In the diagram, Shape is an abstract class.
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