OnJava8-Examples/streams/Prime.java

// streams/Prime.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
import java.util.stream.*;
import static java.util.stream.LongStream.*;

public class Prime {
  public static boolean isPrime(long n) {
    return rangeClosed(2, (long)Math.sqrt(n))
      .noneMatch(i -> n % i == 0);
  }
  public LongStream numbers() {
    return iterate(2, i -> i + 1).filter(Prime::isPrime);
  }
  public static void main(String[] args) {
    new Prime().numbers()
      .limit(10)
      .forEach(n -> System.out.format("%d ", n));
    System.out.println();
    new Prime().numbers()
      .skip(90)
      .limit(10)
      .forEach(n -> System.out.format("%d ", n));
  }
}
/* Output:
2 3 5 7 11 13 17 19 23 29
467 479 487 491 499 503 509 521 523 541
*/