Web Reference: An informative annotation type used to indicate that an interface type declaration is intended to be a functional interface as defined by the Java Language Specification. Nov 20, 2025 · @FunctionalInterface annotation ensures that an interface cannot have more than one abstract method. If multiple abstract methods are present, the compiler throws an “Unexpected @FunctionalInterface annotation” error. Mar 13, 2014 · While in the first case, the annotation is associated with the inner class, in the second case, the annotation is associated with the instance creation expression inside the methods byte code.
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