Drag and drop of a group of files into a JTree in Java

import java.awt.BorderLayout;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.io.File;
import java.util.Iterator;
import java.util.List;
/*from w  w  w .  ja  v a  2s .  co m*/
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.TransferHandler;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;

public class Main {
  public static void main(String args[]) {
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
    DefaultMutableTreeNode mercury = new DefaultMutableTreeNode("Mercury");
    root.add(mercury);
    DefaultMutableTreeNode venus = new DefaultMutableTreeNode("b");
    root.add(venus);
    DefaultMutableTreeNode mars = new DefaultMutableTreeNode("java2s.com");
    root.add(mars);
    MyTree tree = new MyTree(root);

    JScrollPane scrollPane = new JScrollPane(tree);
    frame.add(scrollPane, BorderLayout.CENTER);
    frame.setSize(300, 150);
    frame.setVisible(true);

  }
}

class MyTree extends JTree {

  public MyTree(DefaultMutableTreeNode root) {
    super(root);
    setDragEnabled(false);
    setTransferHandler(new FSTransfer());
  }

}

class FSTransfer extends TransferHandler {
  public boolean importData(JComponent comp, Transferable t) {
    if (!(comp instanceof MyTree)) {
      return false;
    }
    if (!t.isDataFlavorSupported(DataFlavor.javaFileListFlavor)) {
      return false;
    }
    MyTree tree = (MyTree) comp;
    DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
    DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
    try {
      List data = (List) t.getTransferData(DataFlavor.javaFileListFlavor);
      Iterator i = data.iterator();
      while (i.hasNext()) {
        File f = (File) i.next();
        root.add(new DefaultMutableTreeNode(f.getName()));
      }
      model.reload();
      return true;
    } catch (Exception ioe) {
      System.out.println(ioe);
    }
    return false;
  }

  public boolean canImport(JComponent comp, DataFlavor[] transferFlavors) {
    if (comp instanceof MyTree) {
      for (int i = 0; i < transferFlavors.length; i++) {
        if (!transferFlavors[i].equals(DataFlavor.javaFileListFlavor)) {
          return false;
        }
      }
      return true;
    }
    return false;
  }
}