Java 8 # PrimeCheckStream

 import java.util.*;

import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class PrimeCheckStream
{
    public static void main(String[] args)
    {

        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 13, 15);

        List<Integer> primeNumbers = numbers.stream()
                .filter(n -> n > 1)
                .filter(n -> IntStream.rangeClosed(2, (int) Math.sqrt(n))
                        .noneMatch(i -> n % i == 0))
                        .collect(Collectors.toList());

        System.out.println("Prime Numbers: " + primeNumbers);
    }
}