How to Manage Concurrent Access to Lists in Java: Does the JDK Offer a Concurrent List Implementation?

Managing Concurrent Access to Lists in Java

Utilizing collections in multi-threaded environments can introduce concurrency issues. This article explores the availability of a concurrent list implementation in the Java Development Kit (JDK) and provides an alternative solution.

Quest for a Concurrent List

Can we create a concurrent List that allows indexed element access? Does the JDK provide ready-made classes or factory methods for this purpose?

Solution: ConcurrentLinkedQueue

While the JDK doesn't offer a direct implementation of a concurrent list with index-based access, there's an alternative solution that preserves insertion order: java.util.concurrent.ConcurrentLinkedQueue.

This class sacrifices indexed access but maintains order by implementing Iterable. Once all items are added, it allows iteration using enhanced for syntax:

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

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

for (String href : globalQueue) {
    // Perform operations on href
}

This solution ensures thread-safe insertions while providing a way to process elements in the order they were added, resolving the challenge of concurrent list access in Java.

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