Java JTree_1

package com.han;import java.awt.BorderLayout;import javax.swing.JFrame;import javax.swing.JTree;import javax.swing.tree.DefaultMutableTreeNode;import javax.swing.tree.DefaultTreeModel;public class JTree_1 extends JFrame {/** *  */private static final long serialVersionUID = -2628449366554214781L;public JTree_1() {DefaultMutableTreeNode root = new DefaultMutableTreeNode("根节点");DefaultMutableTreeNode nodeFirst = new DefaultMutableTreeNode("一级子节点A");root.add(nodeFirst);DefaultMutableTreeNode nodeSecond = new DefaultMutableTreeNode("二级子节点", false);nodeFirst.add(nodeSecond);root.add(new DefaultMutableTreeNode("一级子节点B"));JTree treeRoot = new JTree(root);getContentPane().add(treeRoot, BorderLayout.WEST);DefaultTreeModel defaultTreeModel = new DefaultTreeModel(root);JTree treeDefault = new JTree(defaultTreeModel);getContentPane().add(treeDefault, BorderLayout.CENTER);// recommended creating methodDefaultTreeModel pointedTreeModel = new DefaultTreeModel(root, true);JTree treePointed = new JTree(pointedTreeModel);getContentPane().add(treePointed, BorderLayout.EAST);}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubJTree_1 instance = new JTree_1();instance.setVisible(true);instance.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);instance.pack();}}