Is it mandatory to use @FunctionalInterface annotation to define a Functional interface in Java 8?

No, it is not mandatory to mark a Functional interface with @FunctionalInterface annotation.

Java does not impose this rule.

But, if we mark an interface with @FunctionalInterface annotation then Java Compiler will give us error in case we define more than one abstract method inside that interface.

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Posted in Java 8, Java 8 Interview Questions

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