Thread Pool

// Java program to illustrate 
// ThreadPool 
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

// Task class to be executed (Step 1) 
class Task implements Runnable
{
    private String name;

    public Task(String s)
    {
        name = s;
    }

    // Prints task name and sleeps for 1s 
    // This Whole process is repeated 5 times 
    public void run()
    {
        try
        {
            for (int i = 0; i<=5; i++)
            {
                if (i==0)
                {
                    Date d = new Date();
                    SimpleDateFormat ft = new SimpleDateFormat("hh:mm:ss");
                    System.out.println("Initialization Time for"
                            + " task name - "+ name +" = " +ft.format(d));
                    //prints the initialization time for every task 
                }
                else
                {
                    Date d = new Date();
                    SimpleDateFormat ft = new SimpleDateFormat("hh:mm:ss");
                    System.out.println("Executing Time for task name - "+
                            name +" = " +ft.format(d));
                    // prints the execution time for every task 
                }
                Thread.sleep(1000);
            }
            System.out.println(name+" complete");
        }

        catch(InterruptedException e)
        {
            e.printStackTrace();
        }
    }
}
public class Test
{
    // Maximum number of threads in thread pool 
    static final int MAX_T = 3;

    public static void main(String[] args)
    {
        // creates five tasks 
        Runnable r1 = new Task("task 1");
        Runnable r2 = new Task("task 2");
        Runnable r3 = new Task("task 3");
        Runnable r4 = new Task("task 4");
        Runnable r5 = new Task("task 5");

        // creates a thread pool with MAX_T no. of 
        // threads as the fixed pool size(Step 2) 
        ExecutorService pool = Executors.newFixedThreadPool(MAX_T);

        // passes the Task objects to the pool to execute (Step 3) 
        pool.execute(r1);
        pool.execute(r2);
        pool.execute(r3);
        pool.execute(r4);
        pool.execute(r5);

        // pool shutdown ( Step 4) 
        pool.shutdown();
    }
}