Web Reference: 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). This tutorial is a guide to different functional interfaces present in Java 8, as well as their general use cases, and usage in the standard JDK library. Aug 7, 2025 · This article dives deep into these built-in functional interfaces, complete with practical examples to solidify your understanding.
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