Web Reference: Oct 23, 2013 · An interface may be declared to be a direct extension of one or more other interfaces, meaning that it implicitly specifies all the member types, abstract methods, and constants of the interfaces it extends, except for any member types and constants that it may hide. 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. Oct 10, 2025 · Interface encourages abstraction (implementation not provided) and loose coupling, and allows multiple different types to be used interchangeably via the interface.
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