[英]How to fix ConcurrentModificationException, removing item from arrayList?
I would like to delete an item from my arrayList while iterating through it, and the ArrayList
has a type class Members. 我想在遍历它时从我的arrayList中删除一个项目,并且
ArrayList
具有类型类Member。 I have read multiple examples of how to fix this problem however none have worked, the ConcurrentModificationException
is still thrown. 我已经阅读了多个如何解决此问题的示例,但是都没有成功,仍然抛出
ConcurrentModificationException
。
Iterator<Members> itr = members.iterator();
while (itr.hasNext()) {
Members foundMember = itr.next();
if (foundMember.equals(member)){
itr.remove();
}
}
The solution i ended up with was, using a CopyOnWriteArrayList, instead of an ArrayList nad using the remove(); 我最终得到的解决方案是使用CopyOnWriteArrayList,而不是使用remove()的ArrayList。 methode.
方法。
EDIT of course my first solution was incorrect facepalm as suggested above, ".removeIf" is most likely the simplest solution. 编辑当然,我的第一个解决方案是上面建议的不正确的facepalm ,“。removeIf”最有可能是最简单的解决方案。
just use a "normal" for loop (I think that should work, pls. take a look at this , btw. an "enhanced for loop" will not work. 只需使用一个“正常”的循环(我认为这应该工作,请。看看这个 ,顺便说一句。“增强的for循环”将无法正常工作。
List<Member> list1 = new ArrayList<>();
List<Member> list2 = new ArrayList<>(list1);
for (int i = 0; i < list1.size(); i++) {
Member member = list1.get(i);
...
list2.remove(member);
}
list1 = list2;
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