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. Default methods are defined with the default modifier, and static methods with the static keyword. All abstract, default, and static methods in an interface are implicitly public, so you can omit the public modifier. In addition, an interface can contain constant declarations. By understanding the fundamental concepts, usage methods, common practices, and best practices of defining Java interfaces, developers can write more modular, maintainable, and flexible code.
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