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With inspiration from other libraries

There is a newer version: 5.17.0

/*
 * Written by Dawid Kurzyniec, based on public domain code written by Doug Lea
 * and publictly available documentation, and released to the public domain, as
 * explained at http://creativecommons.org/licenses/publicdomain
 */

package edu.emory.mathcs.backport.java.util;
import edu.emory.mathcs.backport.java.util.concurrent.helpers.Utils;

/**
 * Overrides toArray() and toArray(Object[]) in AbstractCollection to provide
 * implementations valid for concurrent collections.
 *
 * @author Doug Lea
 * @author Dawid Kurzyniec
 */
public abstract class AbstractCollection extends java.util.AbstractCollection {

    /**
     * Sole constructor. (For invocation by subclass constructors, typically
     * implicit.)
     */
    protected AbstractCollection() { super(); }

    public Object[] toArray() {
        return Utils.collectionToArray(this);
    }

    public Object[] toArray(Object[] a) {
        return Utils.collectionToArray(this, a);
    }
}