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I'm trying to remove some elements from an ArrayList while iterating it like this:
for (String str : myArrayList) { if (someCondition) { myArrayList.remove(str); } } Of course, I get a ConcurrentModificationException when trying to remove items from the list at the same time when iterating myArrayList. Is there some simple solution to solve this problem?
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To Avoid ConcurrentModificationException in single-threaded environment. You can use the iterator remove() function to remove the object from underlying collection object. But in this case, you can remove the same object and not any other object from the list.
How do you fix Java's ConcurrentModificationException? There are two basic approaches: Do not make any changes to a collection while an Iterator loops through it. If you can't stop the underlying collection from being modified during iteration, create a clone of the target data structure and iterate through the clone.
Notice that iterator. remove() doesn't throw an exception by itself because it is able to update both the internal state of itself and the collection. Calling remove() on two iterators of the same instance collection would throw, however, because it would leave one of the iterators in an inconsistent state.
Use an Iterator and call remove():
Iterator<String> iter = myArrayList.iterator(); while (iter.hasNext()) { String str = iter.next(); if (someCondition) iter.remove(); } If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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