Concurrent Collections

In concurrent programming, it is important to use data structures that are thread-safe, meaning they can be accessed and modified by multiple threads simultaneously without causing data corruption or inconsistencies. Java provides a set of concurrent collections specifically designed for this purpose.

CopyOnWriteArrayList

One commonly used concurrent collection in Java is the CopyOnWriteArrayList. It is an implementation of the List interface that allows thread-safe access and modification of its elements. The CopyOnWriteArrayList guarantees that all write operations are performed on a separate copy of the underlying array, while the original array remains unchanged.

Let's take a look at an example that demonstrates the usage of CopyOnWriteArrayList:

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import java.util.concurrent.CopyOnWriteArrayList;

​

public class Main {

    public static void main(String[] args) {

        // Create a concurrent list

        CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();

​

        // Add elements to the list

        list.add("Java");

        list.add("Spring Boot");

        list.add("MySQL");

​

        // Iterate over the list

        for (String element : list) {

            System.out.println(element);

        }

​

        // Add an element while iterating

        list.add("Hibernate");

​

        // Print the updated list

        System.out.println(list);

    }

}