Does Java\'s JDK Offer a Concurrent List with Indexed Access?

Concurrent Collections: Does Java's JDK Offer a Concurrent List?

Maintaining a shared mutable state in multi-threaded applications can be challenging. Java's concurrency framework provides thread-safe collections, but do we have a concurrent implementation of the List interface?

Can I Create a Concurrent List with Indexed Access?

To access elements by index in a concurrent context, we require a data structure that supports both indexed access and safe concurrent access. Let's explore the options provided by the Java Development Kit (JDK).

ConcurrentLinkedQueue: An Alternative with Insertion-Order Preservation

If index-based access is not crucial, and you seek a collection that preserves the order of insertion, consider the ConcurrentLinkedQueue class. It allows concurrent adding and retrieving of elements, though it sacrifices indexed access. However, it implements Iterable, enabling you to iterate over its contents using a for-each loop, as demonstrated in the provided code snippet:

Queue<String> globalQueue = new ConcurrentLinkedQueue<>();

// Multiple threads can safely call globalQueue.add()...

for (String href : globalQueue) {
    // Do something with href
}

In conclusion, while the JDK does not provide a concurrent implementation of List with indexed access, ConcurrentLinkedQueue offers a compromise for applications that prioritize insertion-order preservation over index-based operations. By utilizing its iterable nature, you can still efficiently traverse and process the collection's elements safely in a multi-threaded environment.

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