Web Reference: Nov 27, 2025 · Since Java 8, they can also include default and static methods (with implementation) and since Java 9, private methods are allowed. This example demonstrates how an interface in Java defines constants and abstract methods, which are implemented by a class. To declare a class that implements an interface, you include an implements clause in the class declaration. Your class can implement more than one interface, so the implements keyword is followed by a comma-separated list of the interfaces implemented by the class. However, it can be achieved with interfaces, because the class can implement multiple interfaces. Note: To implement multiple interfaces, separate them with a comma (see example below).
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