// validating/CountedList.java

// (c)2021 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.

// Keeps track of how many of itself are created.

package validating;

import java.util.*;

public class CountedList extends ArrayList<String> {

private static int counter = 0;

private int id = counter++;

public CountedList() {

System.out.println("CountedList #" + id);

}

public int getId() { return id; }

}