javaJTree编程(源代码)

package com.demo; import javax.swing.JFrame; import javax.swing.JTree; import javax.swing.tree.DefaultMutableTreeNode; import com.sun.jndi.url.dns.dnsURLContext; public class JTreeDemo extends JFrame{ JTree tree; DefaultMutableTreeNode group; DefaultMutableTreeNode friend,worker,student; DefaultMutableTreeNode friend1,friend2,worker1,worker2,worker3,student1,student2,student3; public JTreeDemo() { // TODO Auto-generated constructor stub //根节点 group = new DefaultMutableTreeNode("我的群组"); //二级节点 friend = new DefaultMutableTreeNode("我的好友"); worker = new DefaultMutableTreeNode("我的同事"); student = new DefaultMutableTreeNode("我的学生"); //三级节点 friend1 = new DefaultMutableTreeNode("新朋友"); friend2 = new DefaultMutableTreeNode("老朋友"); worker1 = new DefaultMutableTreeNode("成都理工"); worker2 = new DefaultMutableTreeNode("重庆大学"); worker3 = new DefaultMutableTreeNode("四川大学"); student1 = new DefaultMutableTreeNode("软件01"); student2 = new DefaultMutableTreeNode("软件02"); student3 = new DefaultMutableTreeNode("软件03"); friend.add(friend1); friend.add(friend2); worker.add(worker1); worker.add(worker2); worker.add(worker3); student.add(student1); student.add(student2); student.add(student3); group.add(friend); group.add(worker); group.add(student); tree = new JTree(group); tree.collapseRow(1); tree.setToggleClickCount(1); this.getContentPane().add(tree); setSize(300,300); setVisible(true); setTitle("MQQ"); } /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub new JTreeDemo(); } }