What is the @FunctionalInterface annotation ?
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Not frequently asked as it was introduced with Java 8.
 Q1. What is the @FunctionalInterface annotation ?Core Java
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Ans. This is an informative annotation that specify that the interface is a functional interface. A Function Interface has only one abstract method and many default methods. Compiler generates an error if the interface specified with the annotation doesn't abide by the specifications for functional interface.

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