Also, it it very confusing for me that one hand controls half the motion, and the other hand controls half the motion and firing. It seems that one hand should move and the other should fire (perhaps up tu jump, space to fire)?

I meant: public Arrow(double angle) { this.angle = angle; }

This would probably be better: public Arrow(double angle) { } public void addedToWorld(World world) { x = getX(); y = getY(); } public void move() { //call on every act x += Math.sin(Math.toRadians(angle)); y += Math.cos(Math.toRadians(angle)); } To create a left-pointing arrow: getWorld().addObject(new Arrow(270), 580, 185);