please help!

ok well this is what i have tried: import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo) import java.util.List; import java.util.ListIterator; /** * Write a description of class greenTank here. * * @author (your name) * @version (a version number or a date) */ public class greenTank extends platformMover { /** * Act - do whatever the greenTank wants to do. This method is called whenever * the 'Act' or 'Run' button gets pressed in the environment. */ public void act() { turnTowardTank(); int distance = (int)(Math.random()*5)+1; move(distance); } public void turnTowardTank() { World world = getWorld(); List<Tank> tank = world.getObjects(Tank.class); ListIterator<Tank> iter = tank.listIterator(); if(iter.hasNext()) { } Tank enemy = iter.next(); int eX = enemy.getX(); int y = getY(); int x = getX(); int angle = getRotation(); if(x < eX) { if(angle == 180) { turn(); } else if(x > eX) { if(angle == 0) { turn(); } } } } public void turn() { GreenfootImage img = getImage(); img.mirrorVertically(); setImage(img); turn(180); } }