What is not true for functional interface?

What is not true for functional interface?

A functional interface is an interface that contains only one abstract method. They can have only one functionality to exhibit. Since default methods have implementation, they are not abstract. If an interface declares an abstract method overriding one of the public methods of java.lang.Object, that also does not count toward the interface's abstract method count since any implementation of the interface will have an implementation from java.lang.Object or elsewhere.

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