jtree

By using JFileChooser I am able to select file and folders getting JList with File Objects and I am showing it with checkbox. Now my requirement is like I want to show the selected file and folder in tree structure with checkbox and the checkbox should be only for root elements not for all child elements. Example : For Example, I selected folders ABC and PQR which containt sub folders and few files now on UI It should be display Checkbox1 ABC-- --SubFolders . --SubFolder . --Files --Files Checkbox2 PQR-- --SubFolders . --SubFolder . --Files --Files Sounds a bit complicated... as far as the

package xml; import javax.xml.parsers.*; import org.w3c.dom.*; import org.xml.sax.*; import javax.swing.*; import javax.swing.tree.DefaultMutableTreeNode; import java.io.*; public class ThirdParser extends JFrame{ DocumentBuilderFactory factory; DocumentBuilder builder; File f; Document d; JTree tree; JScrollPane scroll; //------------------------------------------------------------------------------ public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable(){ @Override public void run(){ new ThirdParser(); } }); } //------------------------------------------------------

I've created a tree cell renderer/editor framework that is admittedly a little bit hacky, but it works perfectly on Windows and Linux. The image below illustrates a sample setup. The goal is that if the user clicks on the image (numeral) 1 or 2, then the application responds to that click but does not select the tree row. If the user clicks on the text one or two, the application responds to that click and does select the tree row. The way I've implemented this, again, is a little hacky. Basically when the user clicks on the tree row, the editor component is displayed (which looks identical to

File f=new File("C:/"); File fList[] = f.listFiles(); When i use this it list all system file as well as hidden files. and this cause null pointer exception when i use it to show in jTree like this: public void getList(DefaultMutableTreeNode node, File f) { if(f.isDirectory()) { DefaultMutableTreeNode child = new DefaultMutableTreeNode(f); node.add(child); File fList[] = f.listFiles(); for(int i = 0; i < fList.length; i++) getList(child, fList[i]); } } What should i do so that it do not give NullPointerException and show only non hidden and non system files in jTree? Do this for hidden files:

I've seen plenty of examples for changing the icon of nodes during tree instantiation, but I'd like a way to dynamically change the icon of an individual node later. So, in my main code I add my custom renderer to my tree: // Icon I want to set nodes to later ImageIcon checkIcon = new ImageIcon("check.jpg"); // Creates tree with my nodes JTree tree = new JTree(nodes.top); // Create custom renderer Scenario1Renderer renderer = new Scenario1Renderer(); // Set to single tree selection tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION); // Set tree to my custom

I'd like to add the 'expand' button to my JTree's nodes to indicate that they are expandable. The catch is that they have no children until the user clicks on them (due to processing that happens in the background). Is there any way I can set a node as a parent or having children without it actually having children? Thanks It's possible using your own DefaultMutableTreeNode implementation overriding isLeaf() : Returns true if this node has no children. Swing Tutorial: JTree explains it under 4.1 Dynamic Tree . Have a fake child/child count and replace it with real children using