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How to implement the IntPredicate interface using lambda and method reference in Java?
IntPredicate interface is a built-in functional interface defined in java.util.function package. This functional interface accepts one int-valued argument as input and produces a boolean value as an output. This interface is a specialization of the Predicate interface and used as an assignment target for a lambda expression or method reference. It provides only one abstract method, test ().
Syntax
@FunctionalInterface
public interface IntPredicate {
boolean test(int value);
}Example for Lambda Expression
import java.util.function.IntPredicate;
public class IntPredicateLambdaTest {
public static void main(String[] args) {
IntPredicate intPredicate = (int input) -> { // lambda expression
if(input == 100) {
return true;
} else
return false;
};
boolean result = intPredicate.test(100);
System.out.println(result);
}
}Output
true
Example for Method Reference
import java.util.function.IntPredicate;
public class IntPredicateMethodReferenceTest {
public static void main(String[] args) {
IntPredicate intPredicate = IntPredicateMethodReferenceTest::test; // method reference
boolean result = intPredicate.test(100);
System.out.println(result);
}
static boolean test(int input) {
if(input == 50) {
return true;
} else
return false;
}
}Output
false
Updated on: 13-Jul-2020
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