Paragraphs such as the following should make it clearer how the
concurrent classes fit into the Java Memory Model.

 * <p>
 * Memory visibility effects: As with other concurrent collections, state
 * changes to any object made prior to placing it into a <tt>CopyOnWriteArrayList</tt>
 * <a href="package-summary.html#MemoryVisibility"><i>happen-before</i></a>
 * that element is accessed via or removed from the <tt>CopyOnWriteArrayList</tt>.