CopyOnWriteArrayList Example | Java Inspires
in this video, we will see the example for CopyOnWriteArrayList .
here, we will take two threads - one to read and other to modify the list.
if we change CopyOnWriteArrayList to ArrayList then we wil get Exception in thread "Thread-0" java.util.ConcurrentModificationException
So,, CopyOnWriteArrayList helps in concurrent modification and
thread safe...
CopyOnWriteArrayList in Java
CopyOnWriteArrayList is a thread-safe variant of ArrayList in Java found in the `java.util.concurrent` package. It implements the List interface and is designed for use in concurrent environments. Here are key points about CopyOnWriteArrayList:
Functionality: All modifications such as add, set, and remove operations are implemented by creating a fresh copy of the underlying ArrayList.
Concurrency: It is suitable for scenarios where read operations are frequent and updates are less common, making it ideal for high-concurrency environments.
Iterator Behavior: The iterator of CopyOnWriteArrayList creates an immutable snapshot of the original list. Modifications like add() and set() methods on the iterator will throw UnsupportedOperationException, and the iterator will not throw ConcurrentModificationException.
Declaration: `public class CopyOnWriteArrayList extends Object implements List, RandomAccess, Cloneable, Serializable`.
Constructors: It includes constructors like `CopyOnWriteArrayList()`, `CopyOnWriteArrayList(Collection obj)`, and `CopyOnWriteArrayList(Object[] obj)` for creating instances of CopyOnWriteArrayLis.
In summary, CopyOnWriteArrayList is a specialized data structure in Java that ensures thread safety by creating a new copy of the underlying array for each modification operation, making it suitable for scenarios with high read concurrency and infrequent updates.
Thats it..
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CopyOnWriteArrayList
CopyOnWriteArrayList is a thread-safe variant of the traditional ArrayList in Java. Unlike other List implementations, CopyOnWriteArrayList achieves thread safety by creating a new copy of the underlying array whenever there is a modification (add, set, remove operations). This approach ensures that multiple threads can read the list concurrently without the need for explicit synchronization, making it suitable for scenarios where reads significantly outnumber writes.
Key features of CopyOnWriteArrayList include its immutability during iteration, meaning that once an iterator is obtained, it reflects the state of the list at the time of its creation. However, it won't reflect any subsequent modifications. This characteristic makes it ideal for scenarios where a stable snapshot of the data is required without the risk of concurrent modifications affecting the iteration process.
While CopyOnWriteArrayList is useful in certain situations, it comes with trade-offs. The cost of creating a new copy during write operations can make it less efficient for scenarios with frequent modifications. Therefore, it's essential to evaluate its suitability based on the specific requirements of your application.
In summary, CopyOnWriteArrayList provides a convenient solution for scenarios where thread safety during iteration is crucial, and the frequency of write operations is relatively low compared to reads. Understanding its strengths and limitations is key to making informed decisions when implementing concurrent data structures in Java.
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