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 ()). The entire point of interfaces is to give you the flexibility to have your class be forced to implement multiple interfaces, but still not allow multiple inheritance. To implement an interface, the implements operator is used. All methods in the interface must be implemented within a class; failure to do so will result in a fatal error.
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