util.concurrent 是一个 Java 语言的并发开发包，这个类库由以下接口实现组：    <br />    <ul>     <li><code>Sync</code> -- locks, conditions </li>     <li><code>Channel</code> -- queues, buffers </li>     <li><code>Barrier</code> -- multi-party synchronization </li>     <li><code>SynchronizedVariable</code> -- atomic ints, refs etc </li>     <li><code>java.util.Collection</code> -- collections </li>     <li><code>Executor</code> -- replacements for direct use of Thread </li>    </ul> 示例代码：    <pre class="brush:java; toolbar: true; auto-links: false;">public class Executor {     private static Logger logger = Logger.getLogger(Executor.class);     private static PooledExecutor executor = new PooledExecutor(5);         static {         executor.setMinimumPoolSize(2);         executor.setMaximumPoolSize(10);         executor.setKeepAliveTime(1000 * 60 * 10);     }         public static void execute(Runnable runnable) {         try {             executor.execute(runnable);         }         catch (Exception e) {             logger.error("Exception while running task: " + e, e);         }     } }</pre>    <p><strong>项目主页：</strong><a href="http://www.open-open.com/lib/view/home/1326804057655" target="_blank">http://www.open-open.com/lib/view/home/1326804057655</a></p>