InstrumentedHashSet.java

package suntest;
/**
 * This source file is part of project littleaccountbook.
 * This project is under GNU General Public License v2.
 * This Project is a C/S account book.
 * Swing is used to create the GUI of this project and Java DB is used to store data in local machine.
 * Full source code of this project is available at http://littleaccountbook.googlecode.com/svn/trunk/ littleaccountbook-read-only
 * 
 * @author  Moon Zang
 * 
 */

import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;

public class InstrumentedHashSet<E> extends HashSet<E> {
    private int addCount = 0;

    @Override
    public boolean add(E e) {
        addCount++;
        return super.add(e);
    }

    @Override
    public boolean addAll(Collection<? extends E> c) {
        addCount += c.size();
        return super.addAll(c);
    }

    public static void main(String[] args) {
        InstrumentedHashSet<String> s = new InstrumentedHashSet<String>();
        s.addAll(Arrays.asList("Accordion", "Banjo", "Kazoo"));
        System.out.println(s.addCount);
    }
}