advancedMultithreading & Concurrency365 of 436
How can a non-thread-safe collection be used with Stream API?
Tests whether you know a sequential stream over a non-thread-safe collection is safe as long as the source isn't mutated during the stream, but a parallelStream() on the same collection needs a concurrent or externally synchronized source, or you'll get ConcurrentModificationException or corrupted results.
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