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Although expensive, {{CopyOnWriteArrayList}} and {{CopyOnWriteArraySet}} classes are sometimes used to create copies of the core {{Collection}} so that iterators do not fail with a runtime exception when some data in the {{Collection}} is modified. These however, suffer from the {{toArray}} dilemma (operating on stale data) described earlier in this rule. ThereforeConsequently their use is limited to boosting performance in code where the writes are fewer (or non-existent) as compared to the reads \[[JavaThreads 04|AA. Java References#JavaThreads 04]\]. In all other cases they must be avoided. |
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