JTree单击事件

import javax.swing.*;

import javax.swing.tree.*;

import java.awt.FlowLayout;

import java.awt.GridLayout;

public class TreeDemo extends JFrame{

 JTree jTree=new JTree();

 JTextField jTextField =new JTextField();

 GridLayout lay=new GridLayout(1,1);

 public TreeDemo(){

  treeinit();

  this.setSize(400,400);

  this.setLayout(lay);

  this.add(jTree);

  this.add(jTextField);

  this.setVisible(true);

  jTree.addTreeSelectionListener(new javax.swing.event.TreeSelectionListener() {

            public void valueChanged(javax.swing.event.TreeSelectionEvent evt) {

                jTreeValueChanged(evt);

            }

        });

 }

  private void jTreeValueChanged(javax.swing.event.TreeSelectionEvent evt) {

        DefaultMutableTreeNode selectedNode=(DefaultMutableTreeNode) jTree.getLastSelectedPathComponent();//返回最后选定的节点

        if(selectedNode.toString().equals("child")){

         jTextField.setText("I LOVE YOU");

        }

}

 public void treeinit(){

  DefaultMutableTreeNode root=new DefaultMutableTreeNode("root");

  DefaultMutableTreeNode father=new DefaultMutableTreeNode("father");

        DefaultMutableTreeNode child=new DefaultMutableTreeNode("child");

        father.add(child);

        root.add(father);

        TreeModel treeModel = new DefaultTreeModel(root);

        jTree.setModel(treeModel);

 }

 public static void main(String args[]){

  new TreeDemo();

 }

}