final 使用的场景

如果多线程代码写在 主线程中 (可以用到主线程中的变量) 这些变量需要用final来修饰

public List<StatisticErrorBean> statisticAllProducerLog(final String reportS,
			final String[] urls) throws IOException, ParseException {

		final List<StatisticErrorBean> resultList = new ArrayList<StatisticErrorBean>();
		final String mainFolder = "/opt/sasuapps/itrc/logs";

		ExecutorService threadPool = Executors.newFixedThreadPool(10);  
	    CompletionService<Object> completeService = new ExecutorCompletionService<Object>(  
	            threadPool);  
	    
		for (final String url : urls) {

			completeService.submit(new Runnable(){
				
				@Override
				public void run(){
					
					try{
						List<StatisticErrorBean> errorBeanList = new ArrayList<StatisticErrorBean>();

						System.out.println("url--------" + url);
						String directoryURL = decorateDirectoryURL(url);

						List<Link> list = client.readDirectory(mainFolder, directoryURL);

						Map<String, String> allPath = new HashMap<String, String>();
						for (Link link : list) {
							allPath.put(link.getName(), mainFolder + "/" + link.getName()
									+ "/main/error");
						}

						for (String key : allPath.keySet()) {
							System.out.println("looking at path " + allPath.get(key));
							Map<String, Integer> producerLog = statisticProducerLog(
									allPath.get(key), reportS, url);
							if (producerLog != null && producerLog.size() > 0) {
								StatisticErrorBean bean = new StatisticErrorBean();
								bean.setDate(reportS);
								bean.setFeatureName(key);
								bean.setErrorDetails(producerLog);
								errorBeanList.add(bean);

							}
						}
						
						combineList(resultList, errorBeanList);
					}catch(Exception e){
						e.printStackTrace();
					}
					
				}
			}, null);
			
			
		}

		
		for (int i = 0; i < urls.length; i++) {  
	        try {  
	            completeService.take();  
	        } catch (InterruptedException e) {  
	            // TODO Auto-generated catch block  
	            e.printStackTrace();  
	        }  
	    }  
	    threadPool.shutdown();  
		
		return resultList;
	}