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  
        // screen  
        TreeSelectionModel treeSelectionModel = defaultTree.getSelectionModel(); // get  
                                                                                    // the  
                                                                                    // selection  
                                                                                    // model  
        treeSelectionModel 
                .setSelectionMode(TreeSelectionModel.CONTIGUOUS_TREE_SELECTION); 
        defaultTree.addTreeSelectionListener(new TreeSelectionListener() { 
            @Override 
            public 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) ? "" : "-->")); 
              &nb

补充：软件开发 , Java ,

上一个：Java JTree_3
下一个：Java JTree_1