New Concepts in Java 8 by Van Nguyen

Author:Van Nguyen [Nguyen, Van]
Language: eng
Format: epub
Published: 2016-12-16T08:00:00+00:00

In Java 8, an interface is still a functional interface if it has many default methods, which are methods with a body that provide some default implementation for methods in case they are not implemented by a class, as long as it has only 1 abstract method

The signature of the abstract method in a functional interface essentially describes the signature of the Lambda Expression

In Java 8, functional interfaces are annotated with @FunctionalInterface which is used to indicate that the interface is intended to be a functional interface

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