Web Reference: An interface can extend other interfaces, just as a class subclass or extend another class. However, whereas a class can extend only one other class, an interface can extend any number of interfaces. The interface declaration includes a comma-separated list of all the interfaces that it extends. Nov 27, 2025 · A class can extend another class and similarly, an interface can extend another interface. However, only a class can implement an interface and the reverse (an interface implementing a class) is not allowed. Jul 30, 2019 · An interface contains variables and methods like a class but the methods in an interface are abstract by default unlike a class. An interface extends another interface like a class implements an interface in interface inheritance.
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