IT Services Circle
Jan 10, 2024 · Backend Development
Why Using forEach to Remove Elements from an ArrayList Throws ConcurrentModificationException and How to Delete Safely
The article explains why iterating an ArrayList with forEach and removing elements causes a ConcurrentModificationException, analyzes the underlying fail‑fast iterator behavior, and presents three correct ways—using Iterator.remove, removeIf, and collecting then removing—to delete elements safely.
ArrayListConcurrentModificationExceptionIterator
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