Java JTree_1，

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 method DefaultTreeModel 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 stub JTree_1 instance = new JTree_1(); instance.setVisible(true); instance.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); instance.pack(); } }