Web Reference: In the Java programming language, an interface is a reference type, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. 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. This video tutorial explains about the all the things that you should know about the Interfaces in Java. Interfaces have abstract methods and their fields marked as public, stati...more
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