Web Reference: Dec 16, 2023 · In this article, we explored some of the best practices and pitfalls in Java 8’s lambda expressions and functional interfaces. Despite the utility and power of these new features, they are just tools. Nov 20, 2025 · A functional interface in Java is an interface that has only one abstract method, making it suitable for use with lambda expressions and method references (introduced in Java 8). See Syntax of Lambda Expressions for information about how to define lambda expressions. You can use a standard functional interface in place of the interface CheckPerson, which reduces even further the amount of code required.
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