Web Reference: 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. 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. Learn about the functional interfaces in the java.util.function package, which provide target types for lambda expressions and method references. See the interface summary, description, and naming convention for each functional interface, and how to use them in different contexts.
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Last Updated: April 7, 2026
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