Web Reference: Represents a predicate (boolean-valued function) of one argument. This is a functional interface whose functional method is test(Object). Oct 21, 2022 · There are some predefined functional interface in Java like Predicate, consumer, supplier etc. The return type of a Lambda function (introduced in JDK 1.8) is a also functional interface. The Functional Interface PREDICATE is defined in the java.util.function package. 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.
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