Web Reference: 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. In Java, classes can implement multiple interfaces. These interfaces provide different "views" to the class, or different, well, interfaces through which to interact with the class. We distinguish between two kinds of interfaces - normal interfaces and annotation types. This chapter discusses the common semantics of all interfaces - normal interfaces, both top level (§7.6) and nested (§8.5, §9.5), and annotation types (§9.6).
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