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 · Learn how to use functional interfaces with lambda expressions in Java 8. Explore different functional interfaces, such as Function, BiFunction, Supplier, and their specializations and examples. Learn about the functional interfaces in the java.util.function package that provide target types for lambda expressions and method references. See the interface summary, description, and naming convention for each functional interface.
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