Tree Example04

import java.awt.*;import java.util.*;import javax.swing.*;import javax.swing.tree.*;public class ExampleFrame_04 extends JFrame {private JTree tree;public static void main(String args[]) {ExampleFrame_04 frame = new ExampleFrame_04();frame.setVisible(true);}public ExampleFrame_04() {super();setTitle("定制树");setBounds(100, 100, 200, 325);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);DefaultMutableTreeNode root;root = new DefaultMutableTreeNode("企业人事管理系统");DefaultMutableTreeNode nodeFirstA;nodeFirstA = new DefaultMutableTreeNode("人事管理");nodeFirstA.add(new DefaultMutableTreeNode("账套管理"));nodeFirstA.add(new DefaultMutableTreeNode("考勤管理"));nodeFirstA.add(new DefaultMutableTreeNode("奖惩管理"));nodeFirstA.add(new DefaultMutableTreeNode("培训管理"));root.add(nodeFirstA);DefaultMutableTreeNode nodeFirstB;nodeFirstB = new DefaultMutableTreeNode("待遇管理");nodeFirstB.add(new DefaultMutableTreeNode("帐套管理"));nodeFirstB.add(new DefaultMutableTreeNode("人员设置"));nodeFirstB.add(new DefaultMutableTreeNode("待遇报表"));root.add(nodeFirstB);DefaultMutableTreeNode nodeFirstC;nodeFirstC = new DefaultMutableTreeNode("系统维护");nodeFirstC.add(new DefaultMutableTreeNode("企业架构"));nodeFirstC.add(new DefaultMutableTreeNode("基本资料"));nodeFirstC.add(new DefaultMutableTreeNode("系统初始化"));root.add(nodeFirstC);tree = new JTree(root);tree.setRootVisible(false);// 不显示树的根节点tree.setRowHeight(20);// 树节点的行高为20像素tree.setFont(new Font("宋体", Font.BOLD, 14));// 设置树结点的字体// 节点间不采用连接线tree.putClientProperty("JTree.lineStyle", "None");DefaultTreeCellRenderer treeCellRenderer;// 获得树节点的绘制对象treeCellRenderer = (DefaultTreeCellRenderer) tree.getCellRenderer();treeCellRenderer.setLeafIcon(null);// 设置叶子节点不采用图标treeCellRenderer.setClosedIcon(null);// 设置节点折叠时不采用图标treeCellRenderer.setOpenIcon(null);// 设置节点展开时不采用图标Enumeration enumeration; // 按前序遍历所有树节点enumeration = root.preorderEnumeration();while (enumeration.hasMoreElements()) {DefaultMutableTreeNode node;node = (DefaultMutableTreeNode) enumeration.nextElement();if (!node.isLeaf()) {// 判断是否为叶子节点// 创建该节点的路径TreePath path = new TreePath(node.getPath());tree.expandPath(path);// 如果不是则展开该节点}}getContentPane().add(tree, BorderLayout.CENTER);}}