import java.util.*;

public class threadrunnableinterface

{

public static void main(String[] args)

{

Thread clock=new countdown();

ArrayList<Runnable> a=new ArrayList<Runnable>();

a.add(new Launchevent(16,"Flood The Pad!"));

a.add(new Launchevent(6,"Start Engines!"));

a.add(new Launchevent(0,"LiftOff!"));

clock.start();

for(Runnable e :a)

{

new Thread(e).start();

}

}

}

class Launchevent implements Runnable

{

private int time;

private String message;

public Launchevent(int time,String message)

{

this.time=time;

this.message=message;

}

public void run()

{

try

{

Thread.sleep(20000-(time*1000));

}

catch(InterruptedException E)

{}

System.out.println(message);

}

}

class countdown extends Thread

{

public void run()

{

for(int i=20;i>=0;i--)

{

System.out.println("T minus "+i+" seconds");

try

{

Thread.sleep(1000);

}

catch(InterruptedException E)

{}

}

}

}