// references/CloneArrayList.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.

// The clone() operation works for only a few

// items in the standard Java library

import java.util.*;

class Int {

private int i;

public 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 = new ArrayList<>();

for(int i = 0; i < 10; i++)

v.add(new Int(i));

System.out.println("v: " + v);

@SuppressWarnings("unchecked")

ArrayList<Int> v2 = (ArrayList<Int>)v.clone();

// Increment all v2's elements:

for(Int e : v2)

e.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]

*/