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This article mainly introduces "what is the use of the CopyOnWrite collection of Java". In the daily operation, I believe that many people have doubts about the use of the CopyOnWrite collection of Java. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the doubt of "what is the use of the CopyOnWrite collection of Java?" Next, please follow the editor to study!

The CopyOnWrite collection avoids the error of manipulating the collection after getting the iterator of the collection

There are two CopyOnWriteArray collections: CopyOnWriteArrayList and CopyOnWriteArraySet, which are most suitable for situations where read operations usually greatly exceed write operations

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Copy-on-write mode:

In essence, this pattern states that in order to maintain consistent snapshots of objects, rely on immutability to eliminate the synchronization required to coordinate the reading of different but related properties. For collections, this means that if there are a large number of reads (that is, get ()) and iterations, there is no need to synchronize operations to take care of occasional write (that is, add ()) calls.

In the CopyOnWriteArrayList and CopyOnWriteArraySet classes, all mutable operations first take a copy of the background array, make changes to the copy, and then replace the copy. This ensures that a ConcurrentModificationException is never thrown when traversing a collection of its own changes. Traversing the collection is done with the original collection, while the updated collection is used in future operations.

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