Predicate for number - Java Lambda Stream

Java examples for Lambda Stream:Predicate

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Description

Predicate for number

Demo Code



import java.util.Arrays;
import java.util.List;
import java.util.function.Predicate;

public class PredicateDemo {
  public static void main(String args[]) {
    List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, null);

    // Predicate<Integer> predicate = n -> true
    // n is passed as parameter to test method of Predicate interface
    // test method will always return true no matter what value n has.

    System.out.println("Print all numbers:");

    // pass n as parameter
    // eval(list, n -> true);

     Predicate<Integer> predicate1 = n -> n%2 == 0;
    // n is passed as parameter to test method of Predicate interface
    // test method will return true if n%2 comes to be zero

     System.out.println("Print even numbers:");
     eval(list, n -> n % 2 == 0);/*  w  w  w .  j a  va 2s. c  o  m*/

    // Predicate<Integer> predicate2 = n -> n > 3
    // n is passed as parameter to test method of Predicate interface
    // test method will return true if n is greater than 3.

    // System.out.println("Print numbers greater than 3:");
    // eval(list, n -> n > 3);
  }

  public static void eval(List<Integer> list, Predicate<Integer> predicate) {
    for (Integer n : list) {

      if (predicate.test(n)) {
        System.out.println(n + " ");
      }
    }
  }
}

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