Web Reference: 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. The Predicate is a functional interface, which is used to improve manageability of code, helps in unit-testing them separately, It is part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. In this video i'll show you how to use them in Java 8 ...more. In Predicate Interface, there are some default methods.
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