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. The interfaces in this package are general purpose functional interfaces used by the JDK, and are available to be used by user code as well. While they do not identify a complete set of function shapes to which lambda expressions might be adapted, they provide enough to cover common requirements. 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.
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