Predicate Interface is a part of the java.util.function package which is introduced in Java 8. Predicate Negate returns the logical negation of the given predicate. In this post, we are going to see a few implementations of how to use it.
Predicate Negate in Java 8 with Examples...!!! Share on X
Example 1. with ArrayList
import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;
import java.util.stream.Collectors;
public class PredicateInterface_Negate_with_ArrayList_Java8 {
public static void main(String[] args) {
List <Integer> list = Arrays.asList(1, 2, 3, 4, 5);
Predicate <Integer> isEven = i -> i % 2 == 0;
Predicate <Integer> isOdd = isEven.negate();
List <Integer> evenNumbers = list.stream().filter(isEven).collect(Collectors.toList());
List <Integer> oddNumbers = list.stream().filter(isOdd).collect(Collectors.toList());
System.out.println("Even Numbers:\n" + evenNumbers);
System.out.println("\nOdd Numbers:\n" + oddNumbers);
}
}
Example 2. using IntStream
package org.personal.samples;
import java.util.function.IntPredicate;
import java.util.stream.IntStream;
public class PredicateInterface_Negate_with_IntStream_Java8 {
public static void main(String[] args) {
IntPredicate isEven = i -> i % 2 == 0;
IntPredicate isOdd = isEven.negate();
System.out.println("Even Numbers:\n");
IntStream.of(1, 2, 3, 4, 5).filter(isEven).forEach(System.out::println);
System.out.println("\nOdd Numbers:\n");
IntStream.of(1, 2, 3, 4, 5).filter(isOdd).forEach(System.out::println);
}
}
It is quite a useful method and can help shorten the code. I hope the above examples could help you to get a better idea of how and where to use it.
Predicate Negate in Java 8 with Examples...!!! Share on X
Do you like this Post? – then check my other helpful posts:
- Passing Function as a Parameter in another Method in Java 8
- Collection sorting using Lambda in Java 8
- Supplier Interface in Java 8 with Examples
