Web Reference: I always thought declaring attributes in an interface is sort of an anti-pattern as interfaces are stateless. And I haven't had a practical use case for it until I required dependency injection on all the concrete classes implementing the interface. 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. However, it can be achieved with interfaces, because the class can implement multiple interfaces. Note: To implement multiple interfaces, separate them with a comma (see example below).
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