Java SE (Java Platform, Standard Edition)

Hello,

now i' making one java swing window, where i draw some lines(they are for streets) and some circles (for cars) and after than i start a little animation. You can see how the cars are moving on the streets an soforth. I want to change the circles with an image from my pictures. That's why i want to ask you to help me how to draw this images, so that i see the animation with them. Please tell me how can i proceed ?

Thanks in advice