// Represent a moving fish 	
	
import java.awt.*;	
	
public class MovingFish extends Fish {	
	// movement attribute 	
	private Step stroke;	
	
	// MovingFish(): default fish with default movement 	
	public MovingFish() {	
		stroke = new Step(0, 1, -1, 1);	
	}	
	
	// swim(): move the fish 	
	public void swim() {	
		int x = getX();	
		int y = getY();	
	
		x += stroke.xShift();	
		y += stroke.yShift();	
		setPosition(x, y);	
		}	
	}