Sort JTree alphabetical

Question

Hello everyone! I am trying to sort a JTree alphabetical. For the moment i made only the roots (partitions) to sort. I use the JTree to view all the partitions and view all the files. I override the interface TreeNode for my needs...and i made a class for cell renderer...
public class FileTreeNode implements TreeNode
     public File file;
     private File[] children;     
     private  TreeNode parent;     
     public boolean isFileSystemRoot;     
     public FileTreeNode(File file, boolean isFileSystemRoot, TreeNode parent)
          this.file = file;
          this.isFileSystemRoot = isFileSystemRoot;
          this.parent = parent;
          this.children = this.file.listFiles();
          if (this.children == null)
               this.children = new File[0];
     public FileTreeNode(File[] children)
          this.file = null;
          this.parent = null;
          this.children = children;               
     @Override
     public Enumeration<?> children()
          final int elementCount = this.children.length;
          return new Enumeration<File>()
               int count = 0;
               public boolean hasMoreElements()
                    return this.count < elementCount;
               public File nextElement()
                    if (this.count < elementCount)
                         return FileTreeNode.this.children[this.count++];
                    throw new NoSuchElementException("Vector Enumeration");
     @Override
     public boolean getAllowsChildren()
          return true;
     @Override
     public TreeNode getChildAt(int childIndex)
          return new FileTreeNode(this.children[childIndex],this.parent == null, this);
     @Override
     public int getChildCount()
          return this.children.length;
     @Override
     public int getIndex(TreeNode node)
          FileTreeNode ftn = (FileTreeNode) node;
          for (int i = 0; i < this.children.length; i++)
               if (ftn.file.equals(this.children))
                    return i;                    
          return -1;
     @Override
     public TreeNode getParent()
          return this.parent;
     @Override
     public boolean isLeaf()
          return (this.getChildCount() == 0);
     public void sortRoots()
          List<File> list = Arrays.asList(this.children);
          Collections.sort(list);
          System.out.println("Partitions: " + list);
and the other class....public class FileTreeCellRenderer extends DefaultTreeCellRenderer
     private static final long serialVersionUID = 1L;
     protected static FileSystemView fsv = FileSystemView.getFileSystemView();
     private Map<String, Icon> iconCache = new HashMap<String, Icon>();          
     private Map<File, String> rootNameCache = new HashMap<File, String>();     
     public Component getTreeCellRendererComponent(JTree tree, Object value,
               boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus)
          FileTreeNode ftn = (FileTreeNode) value;
          File file = ftn.file;
          String filename = "";
          if (file != null)
               if (ftn.isFileSystemRoot)
                    filename = this.rootNameCache.get(file);
                    if (filename == null)
                         filename = fsv.getSystemDisplayName(file);                         
                         this.rootNameCache.put(file, filename);
               else
                    filename = file.getName();
          JLabel result = (JLabel) super.getTreeCellRendererComponent(tree,
                    filename, selected, expanded, leaf, row, hasFocus);
          if (file != null)
               Icon icon = this.iconCache.get(filename);
               if (icon == null)
                    icon = fsv.getSystemIcon(file);
                    this.iconCache.put(filename, icon);
               result.setIcon(icon);
          return result;
and i run the application...File[] roots = File.listRoots();
FileTreeNode rootTreeNode = new FileTreeNode(roots);
tree = new JTree(rootTreeNode);
tree.setCellRenderer(new FileTreeCellRenderer());
can anyone please help me to sort alphabetical all the files from all the nodes...any help will be appreciated.
Thanks.
Calin                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       

Answer 1

might be easier if you were to add a small pictorial
e.g. if you have a no-arg constructor JTree, you get this
JTree
      colors
               blue
               violet
               red
               yellow
      sports
               basketball
               soccer
               football
               hockey
      food
               hot dogs
               pizza
               ravioli
               bananasnow put it how you would like it sorted