Thread Pools and Executors

ExecutorService and Executors are used to manage and control thread execution efficiently. Thread pools reuse threads and reduce the overhead of thread creation.

Using Executors to Create Thread Pools:

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

class Task implements Runnable {
    private int taskId;

    public Task(int taskId) {
        this.taskId = taskId;
    }

    public void run() {
        System.out.println("Task " + taskId + " is processing.");
    }
}

public class ThreadPoolExample {
    public static void main(String[] args) {
        int numberOfTasks = 5;
        ExecutorService executorService = Executors.newFixedThreadPool(numberOfTasks);

        for (int i = 1; i <= numberOfTasks; i++) {
            Task task = new Task(i);
            executorService.execute(task);
        }

        executorService.shutdown(); // Shutdown the executor service
    }
}

In the example, a fixed-size thread pool is created, and tasks are executed concurrently.