Java Swing - 如何實(shí)現(xiàn)從一個JTree到另一個JTree的拖放

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import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.datatransfer.DataFlavor;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.TransferHandler;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.MutableTreeNode;
import javax.swing.tree.TreePath;
public class Main extends JPanel {
  JTree tree;
  DefaultTreeModel treeModel;
  public static void main(String[] args) {
    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    Main newContentPane = new Main();
    newContentPane.setOpaque(true);
    f.setContentPane(newContentPane);
    f.pack();
    f.setVisible(true);
  }
  public Main() {
    setLayout(new GridLayout(1, 3));
    tree = new JTree(getTreeModel());
 
 
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