Web Reference: Mar 16, 2023 · Yes, a predefined functional interface can have additional non-abstract (default or static) methods without violating the functional interface contract. These additional methods provide utility and convenience, but do not affect the single abstract method requirement. Nov 20, 2025 · Types of Functional Interfaces in Java 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. Functional Interfaces 1. Consumer Consumer interface of the functional interface is the one that accepts only one argument. It is used for performing an action, such as printing or ... Represents a predicate (boolean-valued function) of one argument. This is a functional interface whose functional method is test(Object).
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