32 lines
863 B
Java
32 lines
863 B
Java
// streams/Prime.java
|
|
// (c)2017 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
|
|
*/
|