threadPools.java

import java.text.SimpleDateFormat;
import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

class Task implements Runnable{
    private String name;

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

    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));
                }else{
                    Date d = new Date();
                    SimpleDateFormat ft = new SimpleDateFormat("hh:mm:ss");
                    System.out.println("Executing Time for Task name - " + name + " = " + ft.format(d));
                }
                Thread.sleep(1000);
            }
            System.out.println(name + " complete");
        }catch(InterruptedException e){
            e.printStackTrace();
        }
    }
}

public class threadPools {
    static final int max_t = 3;

    public static void main(String[] args) {
        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");

        ExecutorService pool = Executors.newFixedThreadPool(max_t);

        pool.execute(r1);
        pool.execute(r2);
        pool.execute(r3);
        pool.execute(r4);
        pool.execute(r5);

        pool.shutdown();
    }
}