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Showing content from https://docs.oracle.com/javase/8/docs/api/java/lang/FunctionalInterface.html below:

FunctionalInterface (Java Platform SE 8 )

An informative annotation type used to indicate that an interface type declaration is intended to be a

as defined by the Java Language Specification. Conceptually, a functional interface has exactly one abstract method. Since

have an implementation, they are not abstract. If an interface declares an abstract method overriding one of the public methods of

, that also does

count toward the interface's abstract method count since any implementation of the interface will have an implementation from

or elsewhere.

Note that instances of functional interfaces can be created with lambda expressions, method references, or constructor references.

If a type is annotated with this annotation type, compilers are required to generate an error message unless:

• The type is an interface type and not an annotation type, enum, or class.
• The annotated type satisfies the requirements of a functional interface.

However, the compiler will treat any interface meeting the definition of a functional interface as a functional interface regardless of whether or not a FunctionalInterface annotation is present on the interface declaration.

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