Timer

import greenfoot.*;
public class Timer extends Actor
{
    private int time = 200;
    private boolean start = false;
    public void timer()
    {
        time--;
    }
    public void act()
    {
        if(Greenfoot.isKeyDown("space"))
        {
            start = true;
        }
        if(start == true)
        {
            timer();
        }
        if(time == 0)
        {
            // put your code here
        }
    }
}