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. Sep 23, 2024 · Understanding the difference between interfaces (what) and implementations (how) is a foundational concept in software design that improves flexibility, testability, and maintainability. To declare a class that implements an interface, you include an implements clause in the class declaration. Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class.
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