java – Collections.synchronizedMap(new LinkedHashMap());没有使M

我正在使用以下构造来创建线程安全Map.

Collections.synchronizedMap(new LinkedHashMap());

虽然我收到ConcurrentModificationException错误.

解决方法

In order to guarantee serial access,it is critical that all access to the backing collection is accomplished through the returned collection.
It is imperative that the user manually synchronize on the returned collection when iterating over it:

Collection c = Collections.synchronizedCollection(myCollection);
     ...
  synchronized(c) {
      Iterator i = c.iterator(); // Must be in the synchronized block
      while (i.hasNext())
         foo(i.next());
  }

不遵循此建议可能会导致非确定性行为.

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