JTree ------odd thing

[mira yang]

hi everyone.
i have two frame ,one called 'firstFrame' and one called 'controlFrame'. they are both hold a Jtree. when you selected a leaf node in the controlFrame, it will invoke the method addNode(path,name) to add a new node in the firstFrame. But as you will see, it insert the node into the controlFrame.
first, excute CreateData to get the file 'tree.data'

 import javax.swing.*;
import javax.swing.tree.*;
import java.awt.event.*;
import java.awt.*;
import java.io.*;
public class CreateData {
    public static void main(String args[]){
    JTree   tree=null;
 DefaultMutableTreeNode component = 
      new DefaultMutableTreeNode("Component");
    DefaultMutableTreeNode container = 
      new DefaultMutableTreeNode("Container");
    DefaultMutableTreeNode box = 
      new DefaultMutableTreeNode("Box");
    DefaultMutableTreeNode jComponent = 
      new DefaultMutableTreeNode("JComponent");
    DefaultMutableTreeNode abstractButton = 
      new DefaultMutableTreeNode("AbstractButton");
    DefaultMutableTreeNode jButton = 
      new DefaultMutableTreeNode("JButton");
    DefaultMutableTreeNode jMenuItem = 
      new DefaultMutableTreeNode("JMenuItem");
    DefaultMutableTreeNode jToggle = 
      new DefaultMutableTreeNode("JToggleButton");
    DefaultMutableTreeNode etc = 
      new DefaultMutableTreeNode("...");
    component.add(container);
    container.add(box);
    container.add(jComponent);
    jComponent.add(abstractButton);
    abstractButton.add(jButton);
    abstractButton.add(jMenuItem);
    abstractButton.add(jToggle);
    jComponent.add(etc);
    
   tree=new JTree(component);
try{
           ObjectOutputStream oos=new ObjectOutputStream(new FileOutputStream("tree.data"));
             oos.writeObject(tree);
   
        }catch(Exception e){
        e.printStackTrace();
}
}
  
}
 

// TreePanel is the class who holds and changes the tree

 import javax.swing.*;
import javax.swing.tree.*;
import java.awt.event.*;
import javax.swing.event.*;
import java.awt.*;
public class TreePanel extends JScrollPane implements TreeSelectionListener{

private JTree tree;
private TreePanel  firstPane;
private TreePath  selectedPath;
String paneName;

public TreePanel(TreePanel pane,JTree jtree,String name){
super(jtree);
 firstPane=pane;
tree=jtree;
paneName=name;
               
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
        tree.addTreeSelectionListener(this);
}

     public  void addNode(TreePath path,String name){
  System.out.println("add NOde    in       "+paneName);
 
     DefaultTreeModel model=(DefaultTreeModel)tree.getModel();
MutableTreeNode  node=(MutableTreeNode)path.getLastPathComponent();
 
MutableTreeNode  newNode=new DefaultMutableTreeNode(name);
model.insertNodeInto(newNode,node,node.getChildCount());
    
System.out.println("success");
   
     }
     
    public void valueChanged(TreeSelectionEvent e){
 
        DefaultMutableTreeNode node = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
        selectedPath= e.getPath();
         if(!node.isLeaf()||firstPane==null)  return;
             
          firstPane.addNode(selectedPath,"new");
     }
} 

This class creates the two frame, 'firstFrame' and 'controlFrame'

 import javax.swing.*;
import java.io.*;
import javax.swing.tree.*;

public class TreeTest{
       public static void main(String s[]){
       JFrame firstFrame=new JFrame("first");
       JTree tree=null;
        try{
           ObjectInputStream oos=new ObjectInputStream(new FileInputStream("tree.data"));
        tree=(JTree)oos.readObject();
            oos.close();
        }catch(Exception e){
        e.printStackTrace();
}

TreePanel firstPanel=new TreePanel(null,tree,"firstPane");
firstFrame.getContentPane().add(firstPanel);

firstFrame.setVisible(true);

JFrame controlFrame=new JFrame("controler");
    JTree treew=null;
try{
           ObjectInputStream oos=new ObjectInputStream(new FileInputStream("tree.data"));
        treew=(JTree)oos.readObject();
            oos.close();
        }catch(Exception e){
        e.printStackTrace();
}
System.out.println(tree==treew);    //false

TreePanel panel=new TreePanel(firstPanel,treew,"controler");
controlFrame.getContentPane().add(panel);

controlFrame.setVisible(true);
       }
} 

And please note the output.
What's wrong?

[mira yang]

is anyone else can answer my question?

[maggie woo]

Your TreePanel's constructor adds itself as a TreeSelectionListener. That's why updates occur on the same tree.
You probably need to make the two TreePanels first in your TreeTest class, then add the appropriate TreePanel as a TreeSelectionListener to the other.