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. Overview In this tutorial we will be looking at one of the most fundamental features of functional aspects of Java 8 - functional interfaces. We will start by looking at the definition of functional interfaces and the primary purpose for which they have been added to Java 8.
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