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). Mar 27, 2025 · 1. Introduction 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. Functional interfaces provide target types for lambda expressions and method references. Each functional interface has a single abstract method, called the functional method for that functional interface, to which the lambda expression's parameter and return types are matched or adapted.
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