ConcurrentModificationException和HashSet.iterator() [英] ConcurrentModificationException and HashSet.iterator()
问题描述
我有一个for循环,如
I have a for loop like
for (int neighbour : neighbours) {
我可以在循环中修改邻居
。发现这就是 ConcurrentModificationException
的原因。并阅读 https://stackoverflow.com/a/8189527/292291
Where I may modify neighbours
within the loop. Found that thats the cause of ConcurrentModificationException
. And read from https://stackoverflow.com/a/8189527/292291
因此,如果你想修改列表(或一般的任何集合),
使用迭代器,因为它知道修改因此
将妥善处理。
Hence if you want to modify the list (or any collection in general), use iterator, because then it is aware of the modifications and hence those will be handled properly.
所以我试过:
neighboursItr = neighbours.iterator();
while (neighboursItr.hasNext()) {
// try disconnecting vertices
neighbour = neighboursItr.next();
但这并不能解决问题。为什么?
But that doesnt fix the problem. Why?
推荐答案
你打电话给 neightbours.remove(邻居)
?在那种情况下,这就是问题所在。你需要调用 neightboursItr.remove()
。
Are you calling neightbours.remove(neighbour)
? In that case, that is the problem. You need to call neightboursItr.remove()
instead.
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