HashMap多线程问题，坐等讨论

2015-06-17 05:49:04 294 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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最近修复了一个bug，是由于hashMap的多线程引起的，现把问题简单化，想听听各位大神的见解！
MainClass:

public class MainClass {

	public static void main(String[] args) throws InterruptedException {

		for(int i = 0;i<100;i++){

			Thread t = new Thread(new TaskRunnable(i)); //启动一百个线程测试

			t.start();

		}

	}

}

TaskRunnable:

public class TaskRunnable implements Runnable{

	private int operationNumber;

	public TaskRunnable(int a){

		this.operationNumber = a;

	}

	@Override

	public void run() {

		Action action = new Action();

		Bean bean = action.getAndUpdateBeanFromCache();

		System.out.println("threadId is id = " + Thread.currentThread().getId());

		if(bean==null){

			bean = new Bean();

			bean.setUserId("12344");

			bean.setCount(11);

		}

		Map<String,String> map = bean.getMap();

		map.put(operationNumber+"",operationNumber+"");

		System.out.println("map key = " + operationNumber + " ," + " value = " + operationNumber);

		RedisUtil.setCache(RedisConstant.testKey, new Gson().toJson(bean));

	}

}

Action:

public class Action {

	public Bean getAndUpdateBeanFromCache(){

		Bean bean = new Bean();

		String key = RedisConstant.testKey;

		String value = RedisUtil.getCache(key);

		Type type = new TypeToken<Bean>(){}.getType();

		bean = new Gson().fromJson(value,type);

		return bean;

	}

}

我的测试结果如下：
{"map":{"0":"0","79":"79","86":"86"},"userId":"123456","count":0}，每次map都不同