Web Reference: Learn what an interface is in Java, how to declare and implement one, and why to use it. An interface is an abstract class that groups related methods with empty bodies, and can be implemented by multiple classes. 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. Learn how to use interfaces to define a group of related methods with empty bodies that form the object's interface with the outside world. See an example of how to implement an interface for a bicycle class in Java.
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