// references/CloneArrayList.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.
// The clone() operation works for only a few
// items in the standard Java library
import java.util.*;
import java.util.stream.*;

class Int {
 private int i;
 Int(int ii) { i = ii; }
 public void increment() { i++; }
 @Override
 public String toString() {
 return Integer.toString(i);
 }
}

public class CloneArrayList {
 public static void main(String[] args) {
 ArrayList<Int> v = IntStream.range(0, 10)
 .mapToObj(Int::new)
 .collect(Collectors
 .toCollection(ArrayList::new));
 System.out.println("v: " + v);
 @SuppressWarnings("unchecked")
 ArrayList<Int> v2 = (ArrayList<Int>)v.clone();
 // Increment all v2's elements:
 v2.forEach(Int::increment);
 // See if it changed v's elements:
 System.out.println("v: " + v);
 }
}
/* Output:
v: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
v: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
*/