I think the title sums it up...
public class Player extends Actor
{
protected static GreenfootImage[] image;
static{
image = new GreenfootImage[4];
image [0] = new GreenfootImage("Helicopter1.png");
image [1] = new GreenfootImage("Helicopter3.png");
image [2] = new GreenfootImage("Helicopter2.png");
image [3] = new GreenfootImage("Helicopter3.png");
}
int counter = 0;
public void act()
{
counter = (counter + 1) % image.length;
setImage(image[counter]);
}
}