Why Does Sorting a List Inside a Loop Trigger ConcurrentModificationException?

The article explains how sorting a List while iterating over it in Java can cause a ConcurrentModificationException, describes the fast‑fail mechanism of iterators, shows the root cause in nested method calls, and provides a safe fix using a copied list.

CollectionsConcurrentModificationExceptionDebugging

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Why Does Sorting a List Inside a Loop Trigger ConcurrentModificationException?