public void move(){   
        System.err.println("sy " + sy);
        System.out.println("by " + by);
        System.err.println("sx " + sx);
        System.out.println("bx " + bx);
        
        if(sy > by){
            by+=1;
        } else if (sy < by){
            by-=1;
        } else if (sx > bx){
            bx+=1;
        } else if (sx < bx){
            bx-=1;
        } else {             
            System.out.println("ATTACK!!");
        }
        
    }