final的使用问题

[孤独的狼2021]

public static List<String> getVerificatedIps(String[] serverIps) {
		// 需要返回的List<String> verificatedIps
		final List<String> verificatedIps = new ArrayList<String>();
		ThreadPoolExecutor executorPool = new ThreadPoolExecutor(50, 60, 60,
				TimeUnit.SECONDS, new ArrayBlockingQueue<Runnable>(50),
				new ThreadPoolExecutor.CallerRunsPolicy());
		long startTime = System.currentTimeMillis();
		final int maxCount = 4;

		for (final String ip : serverIps) {
			executorPool.execute(new Runnable() {
				public void run() {
					Integer countSucce = doPingCmd(ip, maxCount);
					if (null != countSucce) {
						System.out.println("host:[ " + ip + " ] ping cout: "
								+ maxCount + " success: " + countSucce);
						// 如果ping成功 则把该IP存到一个List里面
						// 但是verificatedIps是final的。应该这么做呢
						verificatedIps.add(ip);
					} else {
						System.out
								.println("host:[ " + ip + " ] ping cout null");
					}
				}
			});
		}
		while (executorPool.getActiveCount() > 0) {
			try {
				Thread.sleep(100);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		System.out.println("complete ping jobs count = " + serverIps.length
				+ " , total used time(ms) = "
				+ (System.currentTimeMillis() - startTime));
		executorPool.shutdown();
		return verificatedIps;
	}

[JavaNet的牛肉粉丝]

但是verificatedIps是final的。应该这么做呢，final你add值又不影响

[菖蒲老先生]

把verificatedIps定义成类全局变量试试呢。。。

[孤独的狼2021]

引用 1 楼 lvzg_005 的回复:

for循环内部定义一个string，内部处理好的ips，赋值给此string，然后传给外面的String，然后分析字符串

final 能 add

[孤独的狼2021]

引用 3 楼 flagiris 的回复:

把verificatedIps定义成类全局变量试试呢。。。

这样是可以的。。。但是不想用全局

[zxj828282]

top头 top

[lvzg_005]

for循环内部定义一个string，内部处理好的ips，赋值给此string，然后传给外面的String，然后分析字符串