Syntax error How to implement the IntPredicate interface using lambda and method reference in Java?

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: 2020-07-13T12:17:37+05:30

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