Explanation for FunctionalInterface annotation. Functional Interface annotation was introduced to designate an interface as a functional interface in Java

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Java introduced the FunctionalInterface annotation in Java 8 to designate an interface as a functional interface. Functional interfaces are interfaces in Java that have one abstract method and are essential for enabling lambda expressions and simplifying code. The @FunctionalInterface annotation acts as a marker interface and provides documentation to maintain the functional nature of an interface. It is important to use the @FunctionalInterface annotation when creating custom functional interfaces, to communicate intent clearly to other developers, and to encourage the use of lambda expressions.

Functional Interface Annotation in Java

Lambda Expressions and @FunctionalInterface