java.util.ConcurrentModificationException when adding another object

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You cannot modify the collection you are iterating on. That might throw a ConcurrentModificationException. Though it might work sometimes, but it is not guaranteed to work everytime.

If you want to add, or remove something from your list, you need to use an Iterator, or ListIterator for your list. And use ListIterator#add method to add anything in your list. Even if in your iterator, if you try to use List.add or List.remove, you will get that exception, because that doesn’t make any difference. You should use the methods of iterator.

See these posts to understand how to use it: –

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