Web Reference: 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. 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. Mar 27, 2025 · Any interface with a SAM (Single Abstract Method) is a functional interface, and its implementation may be treated as lambda expressions. Note that Java 8’s default methods are not abstract and do not count; a functional interface may still have multiple default methods.
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