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. In this tutorial, we’re going to talk about interfaces in Java. We’ll also see how Java uses them to implement polymorphism and multiple inheritances. To use an interface, you write a class that implements the interface. When an instantiable class implements an interface, it provides a method body for each of the methods declared in the interface.
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