OnJava8-Examples/arrays/CountUpward.java

// arrays/CountUpward.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
import java.util.*;
import java.util.stream.*;
import static onjava.ArrayShow.*;

public class CountUpward {
  static long[] fillCounted(int size) {
    return LongStream.iterate(0, i -> i + 1)
      .limit(size).toArray();
  }
  public static void main(String[] args) {
    long[] l1 = fillCounted(20); // No problem
    show(l1);
    // On my machine, this runs out of heap space:
    //- long[] l2 = fillCounted(10_000_000);
  }
}
/* Output:
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,
17, 18, 19]
*/