Java JTree_2

package com.han;import java.awt.BorderLayout;import java.util.Enumeration;import javax.swing.JFrame;import javax.swing.JTree;import javax.swing.event.TreeSelectionEvent;import javax.swing.event.TreeSelectionListener;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.DefaultTreeModel;import javax.swing.tree.TreePath;import javax.swing.tree.TreeSelectionModel;/** * 处理节点选中事件 *  * @author HAN *  */public class JTree_2 extends JFrame {/** *  */private static final long serialVersionUID = -4187076423981270641L;public JTree_2() {DefaultMutableTreeNode root = new DefaultMutableTreeNode("本地磁盘（D：）");DefaultMutableTreeNode nodePicture = new DefaultMutableTreeNode("图片");root.add(nodePicture);root.add(new DefaultMutableTreeNode("音乐"));nodePicture.add(new DefaultMutableTreeNode("千山——世博园旅游"));DefaultMutableTreeNode nodeSecond = new DefaultMutableTreeNode("凤凰山——大鹿岛旅游");nodePicture.add(nodeSecond);nodeSecond.add(new DefaultMutableTreeNode("大浪淘沙.gif", false));nodeSecond.add(new DefaultMutableTreeNode("辽阔的大海.jpg", false));DefaultTreeModel defaultTreeModel = new DefaultTreeModel(root, true);final JTree defaultTree = new JTree(defaultTreeModel);getContentPane().add(defaultTree, BorderLayout.WEST);// expand initially all nodes@SuppressWarnings("rawtypes")Enumeration enumeration = root.preorderEnumeration();while (enumeration.hasMoreElements()) {DefaultMutableTreeNode node = (DefaultMutableTreeNode) enumeration.nextElement();defaultTree.expandPath(new TreePath(node.getPath()));}// add the tree selection listener, and print the selection path to// screenTreeSelectionModel treeSelectionModel = defaultTree.getSelectionModel(); // get// the// selection// modeltreeSelectionModel.setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION);defaultTree.addTreeSelectionListener(new TreeSelectionListener() {@Overridepublic void valueChanged(TreeSelectionEvent e) {if (!defaultTree.isSelectionEmpty()) {TreePath[] selectionPaths = defaultTree.getSelectionPaths();for (int i = 0; i < selectionPaths.length; i++) {TreePath treePath = selectionPaths[i];Object[] path = treePath.getPath();for (int j = 0; j < path.length; j++) {DefaultMutableTreeNode node = (DefaultMutableTreeNode) path[j];System.out.print(node.getUserObject()+ ((j == path.length - 1) ? "" : "-->"));}System.out.println();}System.out.println();}}});}public static void main(String[] args) {JTree_2 instance = new JTree_2();instance.setVisible(true);instance.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);instance.pack();}}