遍历 arraylist 时抛出 java.util.ConcurrentModificationException

Question

        if (IOThread.getInstance().clientsToAdd.size() > 0) {
            for (Client client : IOThread.getInstance().clientsToAdd) {
                clients.add(client);
                IOThread.getInstance().removeAddedClient(client);
            }
        }

当它在我的主循环中运行时，我会抛出此错误:

    [DEBUG]: Added new connection: 79.142.74.45
Exception in thread "Thread-0" java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:859)
    at java.util.ArrayList$Itr.next(ArrayList.java:831)
    at Server.run(Server.java:35)
    at java.lang.Thread.run(Thread.java:744)

此方法抛出错误:

    public void removeClient(Client client) {
    Iterator<Client> clientIterator = clients.iterator();
    while (clientIterator.hasNext()) {
        Client currentClient = clientIterator.next();
        if (client.equals(currentClient)) {
            clientIterator.remove();
        }
    }
}

Answer 1

此行导致错误:

IOThread.getInstance().removeAddedClient(client);

您在循环访问客户端时正在删除它。请改用 iterator.remove() 。