Checkbox n jtree

Question

hi all.... i wan new in swing
how can i add check box in each node of my jtree?
tis r my full program..... pls help me... tz..........very much
//FileTreePanel.java
package com.y
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import com.y.FileSystemModel;
public class FileTreePanel extends JPanel {
private JTree fileTree;
private FileSystemModel fileSystemModel;
private JTextArea fileDetailsTextArea;
public FileTreePanel( String directory )
fileDetailsTextArea = new JTextArea();
fileDetailsTextArea.setEditable( false );
fileSystemModel = new FileSystemModel(
new File( directory ) );
fileTree = new JTree( fileSystemModel );
fileTree.setEditable( true );
fileTree.addTreeSelectionListener(
new TreeSelectionListener() {
public void valueChanged(
TreeSelectionEvent event )
File file = ( File )
fileTree.getLastSelectedPathComponent();
fileDetailsTextArea.setText(
getFileDetails( file ) );
JSplitPane splitPane = new JSplitPane(
JSplitPane.HORIZONTAL_SPLIT, true,
new JScrollPane( fileTree ),
new JScrollPane( fileDetailsTextArea ) );
setLayout( new BorderLayout() );
add( splitPane );
} // end FileTreePanel constructor
public Dimension getPreferredSize()
return new Dimension( 400, 200 );
private String getFileDetails( File file )
// do not return details for null Files
if ( file == null )
return "";
StringBuffer buffer = new StringBuffer();
buffer.append( "Name: " + file.getName() + "\n" );
buffer.append( "Path: " + file.getPath() + "\n" );
buffer.append( "Size: " + file.length() + "\n" );
return buffer.toString();
public static void main( String args[] )
if ( args.length != 1 )
System.err.println(
"Usage: java FileTreeFrame <path>" );
else {
JFrame frame = new JFrame( "JTree FileSystem Viewer" );
FileTreePanel treePanel = new FileTreePanel( args[ 0 ] );
frame.getContentPane().add( treePanel );
frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
frame.pack();
frame.setVisible( true );
} // end method main
// FileSystemModel.java
package com.y;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class FileSystemModel implements TreeModel {
private File root;
private Vector listeners = new Vector();
public FileSystemModel( File rootDirectory )
root = rootDirectory;
// get hierarchy root (root directory)
public Object getRoot()
return root;
public Object getChild( Object parent, int index )
File directory = ( File ) parent;
String[] children = directory.list();
return new TreeFile( directory, children[ index ] );
public int getChildCount( Object parent )
// get parent File object
File file = ( File ) parent;
// get number of files in directory
if ( file.isDirectory() ) {
String[] fileList = file.list();
if ( fileList != null )
return file.list().length;
return 0; // childCount is 0 for files
// return true if node is a file, false if it is a directory
public boolean isLeaf( Object node )
File file = ( File ) node;
return file.isFile();
// get numeric index of given child node
public int getIndexOfChild( Object parent, Object child )
// get parent File object
File directory = ( File ) parent;
// get child File object
File file = ( File ) child;
// get File list in directory
String[] children = directory.list();
// search File list for given child
for ( int i = 0; i < children.length; i++ ) {
if ( file.getName().equals( children[ i ] ) ) {
// return matching File's index
return i;
return -1; // indicate child index not found
} // end method getIndexOfChild
// invoked by delegate if value of Object at given
// TreePath changes
public void valueForPathChanged( TreePath path,
Object value )
// get File object that was changed
File oldFile = ( File ) path.getLastPathComponent();
// get parent directory of changed File
String fileParentPath = oldFile.getParent();
// get value of newFileName entered by user
String newFileName = ( String ) value;
// create File object with newFileName for
// renaming oldFile
File targetFile = new File(
fileParentPath, newFileName );
// rename oldFile to targetFile
oldFile.renameTo( targetFile );
// get File object for parent directory
File parent = new File( fileParentPath );
// create int array for renamed File's index
int[] changedChildrenIndices =
{ getIndexOfChild( parent, targetFile) };
// create Object array containing only renamed File
Object[] changedChildren = { targetFile };
// notify TreeModelListeners of node change
fireTreeNodesChanged( path.getParentPath(),
changedChildrenIndices, changedChildren );
} // end method valueForPathChanged
// notify TreeModelListeners that children of parent at
// given TreePath with given indices were changed
private void fireTreeNodesChanged( TreePath parentPath,
int[] indices, Object[] children )
// create TreeModelEvent to indicate node change
TreeModelEvent event = new TreeModelEvent( this,
parentPath, indices, children );
Iterator iterator = listeners.iterator();
TreeModelListener listener = null;
// send TreeModelEvent to each listener
while ( iterator.hasNext() ) {
listener = ( TreeModelListener ) iterator.next();
listener.treeNodesChanged( event );
} // end method fireTreeNodesChanged
// add given TreeModelListener
public void addTreeModelListener(
TreeModelListener listener )
listeners.add( listener );
// remove given TreeModelListener
public void removeTreeModelListener(
TreeModelListener listener )
listeners.remove( listener );
// TreeFile is a File subclass that overrides method
// toString to return only the File name.
private class TreeFile extends File {
// TreeFile constructor
public TreeFile( File parent, String child )
super( parent, child );
public String toString()
return getName();
}

Answer 1

Also, use code tags and post a SSCCE -- I'm sure more of your posted code is irrelevant to your question and few people are going to look at a code listing that long.
[http://mindprod.com/jgloss/sscce.html]