Web Reference: To implement an interface, a class must use the implements keyword. A class that implements an interface must implement all of the interface's methods. The following example defines an interface named Animal, with one public method (makeSound ()). Nov 3, 2018 · An interface consists of methods that have no implementations, which means the interface methods are abstract methods. All the methods in interfaces must have public visibility scope. An interface is a set of method declarations and constants. Note that the methods are only declared, not defined; that is, an interface defines a type consisting of abstract methods, where those methods are implemented by client classes as they see fit.
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