31 lines
856 B
Java
31 lines
856 B
Java
// streams/Prime.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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import java.util.stream.*;
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import static java.util.stream.LongStream.*;
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public class Prime {
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public static boolean isPrime(long n) {
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return rangeClosed(2, (long)Math.sqrt(n))
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.noneMatch(i -> n % i == 0);
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}
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public LongStream numbers() {
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return iterate(2, i -> i + 1).filter(Prime::isPrime);
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}
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public static void main(String[] args) {
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new Prime().numbers()
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.limit(10)
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.forEach(n -> System.out.format("%d ", n));
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System.out.println();
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new Prime().numbers()
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.skip(90)
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.limit(10)
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.forEach(n -> System.out.format("%d ", n));
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}
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}
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/* Output:
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2 3 5 7 11 13 17 19 23 29
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467 479 487 491 499 503 509 521 523 541
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*/
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