Java JTree_3

/**
*
*/
package com.han;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Enumeration;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

/**
* This class is to enumerate all the nodes of a tree in different ways ...
* 遍历树节点
* @author HAN
*
*/
public class JTree_3 extends JFrame {

    /**
     *
     */
    private static final long serialVersionUID = -4405016910342910815L;
    DefaultMutableTreeNode root;
    /**
     *
     */
    public JTree_3() {
        root = new DefaultMutableTreeNode("ROOT");
        DefaultMutableTreeNode nodeA = new DefaultMutableTreeNode("nodeA");
        DefaultMutableTreeNode nodeB = new DefaultMutableTreeNode("nodeB");
        DefaultMutableTreeNode nodeC = new DefaultMutableTreeNode("nodeC");
        root.add(nodeA);
        root.add(nodeB);
        root.add(nodeC);

        DefaultMutableTreeNode nodeAA = new DefaultMutableTreeNode("nodeAA");
        DefaultMutableTreeNode nodeAB = new DefaultMutableTreeNode("nodeAB");
        nodeA.add(nodeAA);
        nodeA.add(nodeAB);

        DefaultMutableTreeNode nodeCA = new DefaultMutableTreeNode("nodeCA");
        DefaultMutableTreeNode nodeCB = new DefaultMutableTreeNode("nodeCB");
        DefaultMutableTreeNode nodeCC = new DefaultMutableTreeNode("nodeCC");
        nodeC.add(nodeCA);
        nodeC.add(nodeCB);
        nodeC.add(nodeCC);

        DefaultMutableTreeNode nodeCBA = new DefaultMutableTreeNode("nodeCBA");
        DefaultMutableTreeNode nodeCBB = new DefaultMutableTreeNode("nodeCBB");
        nodeCB.add(nodeCBA);
        nodeCB.add(nodeCBB);

        DefaultTreeModel defaultTreeModel = new DefaultTreeModel(root);
        JTree tree = new JTree(defaultTreeModel);

        @SuppressWarnings("rawtypes")
        Enumeration enumeration = root.preorderEnumeration();
        while (enumeration.hasMoreElements()) {
            DefaultMutableTreeNode node = (DefaultMutableTreeNode) enumeration.nextElement();
            TreePath treePath = new TreePath(node.getPath());
            tree.expandPath(treePath);
        }

        Container container = getContentPane();
        container.add(tree, BorderLayout.WEST);
        // Dimension dimension = container.getPreferredSize();
        JPanel panel = new JPanel(new GridLayout(5, 1, 10, 10));
        JButton b1 = new JButton("按前序遍历");
        JButton b2 = new JButton("按后序遍历");
        JButton b3 = new JButton("以广度优先遍历");
        JButton b4 = new JButton("以深度优先遍历");
        JButton b5 = new JButton("遍历直属子节点");
        panel.add(b1);
        panel.add(b2);
        panel.add(b3);
        panel.add(b4);
        panel.add(b5);
        container.add(panel, BorderLayout.CENTER);

        b1.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                enumerate("按前序遍历");
            }

        });

        b2.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // TODO Auto-generated method stub
                enumerate("按后序遍历&qu

补充：软件开发 , Java ,