Java 8 Predicate Interface

by Online Tutorials Library July 22, 2022

Java Predicate Interface

It is a functional interface which represents a predicate (boolean-valued function) of one argument. It is defined in the java.util.function package and contains test() a functional method.

Java Predicate Interface Methods

Methods	Description
boolean test(T t)	It evaluates this predicate on the given argument.
default Predicate<T> and(Predicate<? super T> other)	It returns a composed predicate that represents a short-circuiting logical AND of this predicate and another. When evaluating the composed predicate, if this predicate is false, then the other predicate is not evaluated.
default Predicate<T> negate()	It returns a predicate that represents the logical negation of this predicate.
default Predicate<T> or(Predicate<? super T> other)	It returns a composed predicate that represents a short-circuiting logical OR of this predicate and another. When evaluating the composed predicate, if this predicate is true, then the other predicate is not evaluated.
static <T> Predicate<T> isEqual(Object targetRef)	It returns a predicate that tests if two arguments are equal according to Objects.equals(Object, Object).

Java Predicate Interface Example 1

 import java.util.function.Predicate; public class PredicateInterfaceExample { public static void main(String[] args) { Predicate<Integer> pr = a -> (a > 18); // Creating predicate System.out.println(pr.test(10));// Calling Predicate method   } } 

Output:

false

Java Predicate Interface Example 2

 import java.util.function.Predicate; public class PredicateInterfaceExample {     static Boolean checkAge(int age){ if(age>17) return true; else return false; }     public static void main(String[] args){     // Using Predicate interface     Predicate<Integer> predicate =  PredicateInterfaceExample::checkAge;     // Calling Predicate method     boolean result = predicate.test(25);     System.out.println(result);     } } 

Output:

true

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Java 8 Predicate Interface

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Java Predicate Interface Methods

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Java Predicate Interface Example 2

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