Perform Parallel Processing on Arrays in Java Using Parallel Streams

Java’s strong idea of parallel processing enables the simultaneous execution of tasks, enhancing application performance. Using Java’s parallel streams is one approach to do parallel processing on arrays. By using multi-core processors, parallel streams allow array items to be processed simultaneously, increasing efficiency.

In this article, we will learn how to perform parallel processing on arrays in Java using parallel streams.

Syntax:

DataType[] array = {};   //Create an array
Arrays.parallelSetAll(array, i -> performOperation(array[i]));  // Perform parallel processing

Program to Perform Parallel Processing on Arrays in Java Using Parallel Streams

Let’s look at an example of utilizing parallel streams to square each member in an array.

Java

// Java Program to perform parallel streams to square each member in an array
import java.util.Arrays;
public class ParallelArrayProcessing
{

    public static void main(String[] args)
    {
        // Create an array of integers
        int[] numbers = {21, 22, 23, 24, 25, 26, 27, 28, 29, 30};
        System.out.println("Initial Array: " + Arrays.toString(numbers));

        // Perform parallel processing using parallel streams
        Arrays.parallelSetAll(numbers, i -> performOperation(numbers[i]));

        // Display the modified array after parallel processing
        System.out.println("Modified Array: " + Arrays.toString(numbers));
    }

    // Example operation to be performed on each element of the array
    private static int performOperation(int value) {
        // In this example, let's square each element
        return value * value;
    }
}

Output

Initial Array: [21, 22, 23, 24, 25, 26, 27, 28, 29, 30]
Modified Array: [441, 484, 529, 576, 625, 676, 729, 784, 841, 900]

Explanation of the Program:

• In the above program, we have created an array of integers.
• Parallel processing is then applied using Arrays.parallelSetAll().
• Here each element is modified based on the specified operation(in this case, squaring each element).
• Finally, the modified array is printed.