public class Car extends Actor
{
    boolean gameStarted = false;
    public void act() 
    {
        // Add your action code here.
        if(Greenfoot.isKeyDown("w"))
        {
            gameStarted = true;
        } 
        while (gameStarted == true)
        {
            move (6);
        }
        if (Greenfoot.isKeyDown("a"))turn(-6);
    }    
}