How to drag and drop shape between two panels

问题

I have two panel, one on the left, which contains my shapes drawn on buttons, and the main panel on the left, where I drop the shapes

How can I implement a drag and drop ?

Edited

this the code I'am using actually that produce a kind of a dragging

  public void mouseReleased(MouseEvent e) {

                    CreateShapeCommand Cmd= new CreateShapeCommand(shape);
                    Caretaker.getInstance().execute(Cmd.copy(e.getX(),e.getY()));   
                }

回答1:

You should get familiar with this tutorial.

来源：https://stackoverflow.com/questions/5474653/how-to-drag-and-drop-shape-between-two-panels