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. In this tutorial, I will continue discuss Interfaces from Java Tutorial 59 - Class Relationships 6-6 Interfaces. Interfaces models a weak is-an-extension-of ... 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.
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