Code Samples from the Java Developers Almanac 2000

 public class DropTargetComponent extends JComponent 
   implements DropTargetListener {
     public DropTargetComponent() {
       new DropTarget(this, this);
         }
     public void dragEnter(DropTargetDragEvent evt) {
       // Called when the user is dragging and enters 
       // this drop target.
     }
     public void dragOver(DropTargetDragEvent evt) {
        // Called when the user is dragging and moves 
        // over this drop target.
     }
     public void dragExit(DropTargetEvent evt) {
        // Called when the user is dragging and 
        // leaves this drop target.
     }
     public void dropActionChanged(
       DropTargetDragEvent evt) {
         // Called when the user changes the drag 
         // action between copy or move.
     }
     public void drop(DropTargetDropEvent evt) {
        // Called when the user finishes or cancels 
        // the drag operation.
     }
 }