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

public class Ex3
{
    public static void main(String[] args)
    {        
        System.out.println("------Cached Pool------");
        ExecutorService execCached = Executors.newCachedThreadPool();
        execCached.execute(new Imex31());
        execCached.execute(new Imex32());
        execCached.execute(new Imex33());
        execCached.shutdown();
        
        System.out.println("------Fixed Pool------");
        ExecutorService execFixed = Executors.newFixedThreadPool(3);
        execFixed.execute(new Imex31());
        execFixed.execute(new Imex32());
        execFixed.execute(new Imex33());
        execFixed.shutdown();
        
        System.out.println("------Single Thread------");
        ExecutorService execSingle = Executors.newSingleThreadExecutor();
        execSingle.execute(new Imex31());
        execSingle.execute(new Imex32());
        execSingle.execute(new Imex33());
        execSingle.shutdown();
        
        /*Thread t1 = new Thread(new Imex31());
        Thread t2 = new Thread(new Imex32());
        Thread t3 = new Thread(new Imex33());
        
        t1.start();
        t2.start();
        t3.start();*/
    }

}

class Imex31 implements Runnable
{
    public Imex31()
    {
        System.out.println("Constructor 1 begin");
    }
    public void run()
    {
        for (int i = 1; i < 4; i++)
        {
            System.out.println("In the run ex1 " + i);
            Thread.yield();
        }
        System.out.println("ex1 complete");
        return;
    }
}

class Imex32 implements Runnable
{
    public Imex32()
    {
        System.out.println("Constructor 2 begin");
    }
    public void run()
    {
        for (int i = 1; i < 4; i++)
        {
            System.out.println("In the run ex2 " + i);
            Thread.yield();
        }
        System.out.println("ex2 complete");
        return;
    }
}

class Imex33 implements Runnable
{
    public Imex33()
    {
        System.out.println("Constructor 3 begin");
    }
    public void run()
    {
        for (int i = 1; i < 4; i++)
        {
            System.out.println("In the run ex3 " + i);
            Thread.yield();
        }
        System.out.println("ex3 complete");
        return;
    }
}