Web Reference: We distinguish between two kinds of interfaces - normal interfaces and annotation types. This chapter discusses the common semantics of all interfaces-normal interfaces and annotation types (§9.6), top-level (§7.6) and nested (§8.5, §9.5). Nov 27, 2025 · An Interface in Java is an abstract type that defines a set of methods a class must implement. An interface acts as a contract that specifies what a class should do, but not how it should do it. Learn Java interfaces including abstract methods, default methods, static methods, functional interfaces, inheritance, and real-world implementation examples.
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