Simple Java - Graphic

Need some help. I have made some arc in java and some sinus curve (animation) 1. Need the sinus curve should be in a circle (circle is made allready also the sinus curve) 2. The arc which I have made, have to move like the number 8. Up and down. The arc is like a snake. there is 2 of them. 1 left and 1 right. I should be able to change the speed of movement of the arc (snake) Everything is made, just need some modifications.