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Java 8 Functional Interfaces - BiPredicate.test() Examples

Java 8 Functional Interfaces Java Java API 

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Interface:

java.util.function.BiPredicate<T,U>

java.util.function.BiPredicateBiPredicateLogicBig

Method:

boolean test(T t, U u)

Evaluates this predicate on the given arguments.

Parameters:
t - the first input argument
u - the second input argument
Returns:
true if the input arguments match the predicate, otherwise false


Examples


package com.logicbig.example.bipredicate;

import java.util.function.BiPredicate;

public class TestExample {

    public static void main(String... args) {
        BiPredicate<Integer, Integer> multiplePredicate = (a, b) -> a % b == 0;
        boolean b = multiplePredicate.test(72, 9);
        System.out.println(b);
    }
}

Output

true




Assigning to a static method reference 

package com.logicbig.example.bipredicate;

import java.util.function.BiPredicate;

public class TestExample2 {

    public static void main(String... args) {
        BiPredicate<Integer, Integer> multiplePredicate = TestExample2::isMultipleOf;
        boolean b = multiplePredicate.test(7847, 1121);
        System.out.println(b);
    }

    private static boolean isMultipleOf(Integer a, Integer b) {
        return a % b == 0;
    }
}

Output

true




package com.logicbig.example.bipredicate;

import java.util.List;
import java.util.function.BiPredicate;
import java.util.stream.Collectors;

public class TestExample3 {

    public static void main(String... args) {
        List<Integer> list = List.of(1, 4, 5, 8, 11);
        //static method reference
        List<Integer> l = searchList(list, Integer::equals, 4);
        System.out.println(l);

        //instance method reference
        List<String> cars = List.of("cadillac", "chrysler", "ferrari");
        List<String> l2 = searchList(cars, String::startsWith, "c");
        System.out.println(l2);

        //instance method reference on a given instance
        String s = "I drive a ferrari car";
        List<String> l3 = searchList(cars, s::startsWith, 10);
        System.out.println(l3);
    }

    public static <T, U> List<T> searchList(List<T> l, BiPredicate<T, U> searchPredicate, U userObject) {
        return l.stream().filter(e -> searchPredicate.test(e, userObject))
                .collect(Collectors.toList());
    }

}

Output

[4]
[cadillac, chrysler]
[ferrari]

See Also