re: Java lambda expressions recap VIEW POST

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re: Thanks for the post Erik. What does the @FunctionalInterface do? I thought that: for any one-method interface, Java knows how to cast a lambda ex...
 

orenovadia, your right: the annotation is not needed.

The @FunctionalInterface annotation enables the compiler to report an error if the interface is not a functional interface, i.e. it has exactly one abstract method. Beside that, it communicates the intend that the interface is a functional interface to the reader.

 
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