For循环中的java.util.ConcurrentModificationException [英] java.util.ConcurrentModificationException in For loop

问题描述

我正在尝试编写IM软件， 我想让用户离开对话，并告诉他的伴侣他已经离开了... 我更喜欢使用for循环而不是Iterator，寻找所有用户并让要离开并删除他的用户...像这样:

I am trying to program an IM software, I want to let user leave the conversation and tell his partner that he has left... I prefer to use for loop instead Iterator, seek all the users and get the user who ask to leave and remove him... like that:

   for(Clientuser Cu: EIQserver.OnlineusersList)
          if(Cu.ID.equals(thsisUser.ID)) // find the user who ask to leave 
          {
          Omsg.setBody("@@!&$$$$@@@####$$$$"); //code means : clien! ur parter leaves...
                 sendMessage(Omsg); // sed message to thje partner with that code
                 EIQserver.OnlineusersList.remove(Cu);// remove the partner
                EIQserver.COUNTER--;// decrease counter.

          }

我得到异常:java.util.ConcurrentModificationException

I get Exception: java.util.ConcurrentModificationException

我正在使用迭代器，为了摆脱此异常，我将其转换为for，但是仍然出现相同的异常！ 我如何摆脱这个例外?

I was using iterators, and to get rid of this exception, I convert to for, but the same exception still appears!! how may I get rid of this exception?

推荐答案

使用迭代器，而不是循环.例如:

Use Iterator instead of looping. For example:

Iterator<Clientuser> iterator = EIQserver.OnlineusersList.iterator();
while (iterator.hasNext()) {
    Clientuser next = iterator.next();
    if(next.ID.equals(thsisUser.ID)) {
        Omsg.setBody("@@!&$$$$@@@####$$$$"); 
        sendMessage(Omsg); 
        iterator.remove();// remove the partner
    }
}

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