Web Reference: Oct 21, 2025 · In Java, classes and interfaces are used to define the structure and behavior of programs. While they might seem similar, since both can hold methods and variables, they have very different purposes. The relationship between a class implementing an interface and that interface is best described as an IS association. As in: an Employee IS (implements) Fireable. In summary, a class represents a concrete implementation, while an interface represents a set of behaviors that a class can implement. When it comes to object-oriented programming, two fundamental concepts are classes and interfaces.
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