Web Reference: Nov 20, 2025 · Java 8 introduced four main functional interface types under the package java.util.function. These are widely used in Stream API, collections and lambda-based operations. 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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