Collection ConcurrentModificationException异常

/** * ConcurrentModificationException异常，此异常通常在一个集合为多个线程使用的场景中。 * <p><strong>解决办法：</strong></p> * <p> * 1、使用copy办法，如<pre> * String[] tmpStrArr = new String[arrayListInst.size()]; * for (String tmp : tmpStrArr) { * System.out.println(tmp); * } * </pre> * 2、使用特定的集合实例，需要花费性能代价 * </p> * @author WangYanCheng * @version 2010-11-10 */public class ConcurrentExceptionArrayListTest { /** 集合 */ private List<String> rtnList = /*new ArrayList<String>();*/new CopyOnWriteArrayList<String>();/*Collections.synchronizedList(new ArrayList<String>());*/ /** * 数据生产者 * @author WangYanCheng * @version 2011-6-16 */ class ProducterThread extends Thread { private boolean startFlag = true; private Random randInst; /** * Constructor */ public ProducterThread() { randInst = new Random(); } /** * 线程停止 * @param startFlag */ public void stopThread(boolean startFlag) { this.startFlag = startFlag; } /** * runnable */ public void run() { while (this.startFlag) { rtnList.add(String.valueOf(randInst.nextDouble())); try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } } } /** * 数据消费者 * @author WangYanCheng * @version 2011-6-16 */ class ConsumerThread extends Thread { private boolean startFlag = true; /** * 线程停止 * @param startFlag */ public void stopThread(boolean startFlag) { this.startFlag = startFlag; } public void run() { while (this.startFlag) { doPrintList(rtnList.toArray(new String[rtnList.size()])); doPrintList(rtnList.iterator()); try { Thread.sleep(5); } catch (InterruptedException e) { e.printStackTrace(); } } } } public void doPrintList(Iterator<String> iterator) { for (;iterator.hasNext();) { System.out.print(iterator.next() + "/t"); } System.out.println(); } public void doPrintList(String[] listArr) { for (String str : listArr) { System.out.print(str.concat("/t")); } System.out.println(); } /** * 生成消费者线程对象 * @return {@link ConsumerThread} */ public ConsumerThread getConsumerThread() { return new ConsumerThread(); } /** * 生成生产者线程对象 * @return {@link ProducterThread} */ public ProducterThread getProducterThread() { return new ProducterThread(); } /** * 测试入口 * @param args 参数列表 */ public static void main(String[] args) { ConcurrentExceptionArrayListTest cowALT = new ConcurrentExceptionArrayListTest(); cowALT.getProducterThread().start(); cowALT.getConsumerThread().start(); try { Thread.sleep(500000); } catch (InterruptedException e) { e.printStackTrace(); } }}