Web Reference: Mar 27, 2025 · 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. Mar 16, 2023 · Java 8 has provided some Predefined (Built-in) Functional Interfaces to make our programming easier. Moreover, Predefined Functional Interfaces include most commonly used methods which are available to a programmer by default. 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). Use @FunctionalInterface to ensure only one abstract method (annotation is optional). Enable clean, concise code using lambdas and method references.
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