How Can I Make an ArrayList Thread-Safe in Java?

Thread-Safe ArrayList in Java: Exploration of Another Approach

A common challenge in multithreaded programming is ensuring the safety of shared data structures, such as the ArrayList. In this scenario, a Race class manages an ArrayList to capture RaceCar objects as they finish executing. However, the ArrayList is inherently not thread-safe, raising concerns about data integrity.

Initially, an attempt was made to use Collections.synchronizedCollection(c Collection) to create a thread-safe ArrayList. However, the compiler objected, indicating a mismatch between the Collection type and the desired ArrayList type.

Alternative Approach: Collections.synchronizedList()

An effective approach for achieving thread-safety with an ArrayList is to utilize the Collections.synchronizedList() method. This method returns a thread-safe List, backed by an underlying ArrayList, which allows the program to continue using the ArrayList interface for manipulating the data.

To implement this approach, the following code segment can be used:

<code class="java">List<RaceCar> finishingOrder = Collections.synchronizedList(new ArrayList<>());</code>

With this modification, the ArrayList is now protected against concurrent access, ensuring that the order in which RaceCar objects finish the race is accurately maintained.

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