Java8 – Functional Interface

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

public class Java8Fearure {

	public static void main(String args[]) {
	      List<Integer> list = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9);
	         
	      //1. 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:");
	      evaluate(list, n -> true);
	         
	      //2. Predicate<Integer> predicate1 = n -> n%3 == 0
	      // n is passed as parameter to test method of Predicate interface
	      // test method will return true if n%3 comes to be zero	         
	      System.out.println("Print which numbers are divided by 3:");
	      evaluate(list, n -> n % 3 == 0 );
	         
	      //3. Predicate<Integer> predicate2 = n -> n > 5
	      // n is passed as parameter to test method of Predicate interface
	      // test method will return true if n is greater than 5.        
	      System.out.println("Print numbers greater than 5:");
	      evaluate(list, n -> n > 5 );
	 }
	     
	 public static void evaluate(List<Integer> list, Predicate<Integer> predicate) {
	     for(Integer n: list) {
	         if(predicate.test(n)) {
	            System.out.println(n + " ");
	         }
	     }
	 }
	   
}