import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;public class TreeDemo {public static void main(String[] args) {// 创建没有父节点和子节点、但允许有子节点的树节点，并使用指定的用户对象对它进行初始化。// public DefaultMutableTreeNode(Object userObject)DefaultMutableTreeNode node1 = new DefaultMutableTreeNode("软件部");node1.add(new DefaultMutableTreeNode(new User("小花")));node1.add(new DefaultMutableTreeNode(new User("小虎")));node1.add(new DefaultMutableTreeNode(new User("小龙")));DefaultMutableTreeNode node2 = new DefaultMutableTreeNode("销售部");node2.add(new DefaultMutableTreeNode(new User("小叶")));node2.add(new DefaultMutableTreeNode(new User("小雯")));node2.add(new DefaultMutableTreeNode(new User("小夏")));DefaultMutableTreeNode top = new DefaultMutableTreeNode("职员管理");top.add(new DefaultMutableTreeNode(new User("总经理")));top.add(node1);top.add(node2);final JTree tree = new JTree(top);JFrame f = new JFrame("JTreeDemo");f.add(tree);f.setSize(300, 300);f.setVisible(true);f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 添加选择事件tree.addTreeSelectionListener(new TreeSelectionListener() {@Overridepublic void valueChanged(TreeSelectionEvent e) {DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();if (node == null)return;Object object = node.getUserObject();if (node.isLeaf()) {User user = (User) object;System.out.println("你选择了：" + user.toString());}}});}
}class User {private String name;public User(String n) {name = n;}// 重点在toString，节点的显示文本就是toStringpublic String toString() {return name;}
}