How to organize parallel processing of multiple threads in a program?

To organize parallel processing of multiple threads in Java, you can use the Thread class or the Runnable interface. It is also more convenient to use a thread pool from ExecutorService, which manages the number of threads and their execution.

Example using ExecutorService:

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ParallelProcessing {
    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(3); // pool of 3 threads

        for (int i = 0; i < 5; i++) {
            int taskId = i;
            executor.submit(() -> {
                System.out.println("Executing task " + taskId + " in thread " + Thread.currentThread().getName());
                // task code here
            });
        }

        executor.shutdown(); // stop accepting new tasks
    }
}

This approach allows running multiple tasks simultaneously, efficiently utilizing processor resources.