// references/SimplerMutableInteger.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.
// A trivial wrapper class
import java.util.*;
import java.util.stream.*;

class IntValue2 {
 public int n;
 IntValue2(int n) { this.n = n; }
}

public class SimplerMutableInteger {
 public static void main(String[] args) {
 List<IntValue2> v = IntStream.range(0, 10)
 .mapToObj(IntValue2::new)
 .collect(Collectors.toList());
 v.forEach(iv2 ->
 System.out.print(iv2.n + " "));
 System.out.println();
 v.forEach(iv2 -> iv2.n += 1);
 v.forEach(iv2 ->
 System.out.print(iv2.n + " "));
 }
}
/* Output:
0 1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10
*/