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Difference between Synchronized ArrayList and CopyOnWriteArrayList in Java
Synchronized ArrayList and CopyOnWriteArrayList are useful for synchronizing the ArrayList. This is necessary for a multi-threaded environment to make sure thread safety is achieved.
The differences between Synchronized ArrayList and CopyOnWriteArrayList are given as follows −
| Synchronized ArrayList | CopyOnWriteArrayList |
|---|---|
| Synchronized ArrayList is used to synchronize the ArrayList. | CopyOnWriteArrayList is used to synchronize the ArrayList. |
| The Java 1.2 version first introduced the Synchronized ArrayList. | The Java 1.5 version first introduced the CopyOnWriteArrayList. |
| The Synchronized ArrayList should be used when there are more write operations than reading operations in ArrayList. | The CopyOnWriteArrayList should be used when there are more read operations than write operations in ArrayList. |
| This iterator is a fail-fast iterator. | This iterator is a fail-safe iterator. |
| The synchronized block should contain the iteration of the list. | The iteration of the list can be outside the synchronized block. |
| During the read or write operation, the whole ArrayList is locked by Synchronized ArrayList for thread safety. | During the write operation only, the whole ArrayList is locked by CopyOnWriteArrayList for thread safety. |
| The Synchronized ArrayList should be used when the ArrayList is larger. | The CopyOnWriteArrayList should be used when the ArrayList is smaller. |
Updated on: 30-Jul-2019
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