java ArrayList在迭代时删除对象
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java ArrayList remove object while iterating
提问by Ceri Turner
I'm running an iterator over an arraylist and am trying to remove an item when a condition is true.
我正在一个数组列表上运行一个迭代器，并试图在条件为真时删除一个项目。
I have the following code:
我有以下代码：
String item = (String) model.getElementAt(selectedIndices[i]);
Iterator it = p.eggMoves.iterator();
while(it.hasNext())
{
String text = (String) it.next();
if ( text.equals(item) )
{
it.remove();
p.eggMoves.remove(selectedIndices[i]);
model.removeElementAt(selectedIndices[i]);
}
}
Now this code works fine, the item is removed from both the p object and the jlist, but it throws an "ConcurrentModificationException" exception at the it.next() line.
现在这段代码工作正常，项目从 p 对象和 jlist 中删除，但它在 it.next() 行抛出“ConcurrentModificationException”异常。
How do I solve this?
我该如何解决这个问题？
采纳答案by Braj
Just remove the item by using it.remove()while iterating.
只需it.remove()在迭代时使用即可删除项目。
Below line is causing the issue
下面的行导致了这个问题
p.eggMoves.remove(selectedIndices[i]);
What you want to do by removing same item (that is at index i) again and again?
您想通过一次又一次地删除相同的项目（即索引 i）来做什么？
回答by rgettman
There is no need to call both it.remove();and p.eggMoves.remove(selectedIndices[i]);. The call to it.remove();will remove the current item from p.eggMoves.
没有必要同时调用it.remove();和p.eggMoves.remove(selectedIndices[i]);。调用it.remove();将从 中删除当前项目p.eggMoves。
Remove the call to p.eggMoves.remove(selectedIndices[i]);and it should work fine.
删除对的调用p.eggMoves.remove(selectedIndices[i]);，它应该可以正常工作。
