Displaying Hierarchical Data within a JTree : Tree « Swing JFC « Java

Displaying Hierarchical Data within a JTree

Displaying Hierarchical Data within a JTree
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Container;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreeCellRenderer;
import javax.swing.tree.TreePath;

public class TreeIt {

  class MyCellRenderer extends JLabel implements TreeCellRenderer {
    MyCellRenderer() {

    public Component getTreeCellRendererComponent(JTree tree, Object value,
        boolean selected, boolean expanded, boolean leaf, int row,
        boolean hasFocus) {
      StringBuffer text = new StringBuffer();
      if (expanded)
      if (leaf)
      if (hasFocus)
      text.append(row + "->");

      setBackground(selected ? Color.BLUE : Color.YELLOW);
      setForeground(selected ? Color.YELLOW : Color.BLUE);

      return this;

  public TreeIt() {
    JFrame f = new JFrame();
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Calendar");
    DefaultMutableTreeNode months = new DefaultMutableTreeNode("Months");
    String monthLabels[] = { "January", "February", "March", "April",
        "May", "June", "July", "August", "September", "October",
        "November", "December" };
    for (int i = 0, n = monthLabels.length; i < n; i++)
      months.add(new DefaultMutableTreeNode(monthLabels[i]));
    DefaultMutableTreeNode weeks = new DefaultMutableTreeNode("Weeks");
    String weekLabels[] = { "Monday", "Tuesday", "Wednesday", "Thursday",
        "Friday", "Saturday", "Sunday" };
    for (int i = 0, n = weekLabels.length; i < n; i++)
      weeks.add(new DefaultMutableTreeNode(weekLabels[i]));
    JTree jt = new JTree(root);
    jt.addTreeSelectionListener(new TreeSelectionListener() {
      public void valueChanged(TreeSelectionEvent e) {
        TreePath path = e.getPath();
        System.out.println("Picked: " + path.getLastPathComponent());
        Object elements[] = path.getPath();
        for (int i = 0, n = elements.length; i < n; i++) {
          System.out.print("->" + elements[i]);

    DefaultMutableTreeNode lastLeaf = root.getLastLeaf();
    TreePath path = new TreePath(lastLeaf.getPath());

    jt.setCellRenderer(new MyCellRenderer());

    JScrollPane jsp = new JScrollPane(jt);
    Container c = f.getContentPane();
    c.add(jsp, BorderLayout.CENTER);
    f.setSize(250, 250);

  public static void main(String args[]) {
    new TreeIt();


Related examples in the same category

1.Build a tree based on DefaultMutableTreeNodeBuild a tree based on DefaultMutableTreeNode
2.Add Tree to JScrollPaneAdd Tree to JScrollPane
3.Genealogy TreeGenealogy Tree
4.Tree LinesTree Lines
5.DefaultMutableTreeNode Node Tree SampleDefaultMutableTreeNode Node Tree Sample
6.Display a file system in a JTree viewDisplay a file system in a JTree view
7.implements TreeSelectionListener to create your own listenerimplements TreeSelectionListener  to create your own listener
8.File folder Tree with iconsFile folder Tree with icons
9.File Tree with Popup MenuFile Tree with Popup Menu
10.File Tree with TooltipsFile Tree with Tooltips
11.Ancestor Tree with IconsAncestor Tree with Icons
12.Tree Icon DemoTree Icon Demo
13.DefaultMutableTreeNode and user objectDefaultMutableTreeNode and user object
14.Display user object in a treeDisplay user object in a tree
15.Tree Expand Event DemoTree Expand Event Demo
16.Tree: Drag and DropTree: Drag and Drop
17.Tree open IconTree open Icon
18.Traverse TreeTraverse Tree
19.Tree based on Array structureTree based on Array structure
20.Tree will Expand event and listenerTree will Expand event and listener
21.Set the Tree LineSet the Tree Line
22.Tree Selection RowTree Selection Row
24.Install ToolTips for Tree (JTree)Install ToolTips for Tree (JTree)
25.Tree Expand Event Demo 2Tree Expand Event Demo 2
26.A tree with componentA tree with component
27.A sample component for dragging and dropping a collection of files into a tree.A sample component for dragging and dropping a collection of files into a tree.
28.DnD (drag and drop)JTree code DnD (drag and drop)JTree code
29.Build a tree and populate it from hashtablesBuild a tree and populate it from hashtables
30.A simple test to see how we can build a tree and populate itA simple test to see how we can build a tree and populate it
31.Installs custom iconsInstalls custom icons
32.Build a tree and customize its iconsBuild a tree and customize its icons
33.Add and remove tree Node and expand the tree node
34.File System Tree
35.TreeExpansionListener and TreeExpansionEventTreeExpansionListener and TreeExpansionEvent
36.Enabling and Disabling Multiple Selections in a JTree Component
37.Allow only a single node to be selected (default)
38.Allow selection to span one vertical contiguous set of visible nodes
39.Allow multiple selections of visible nodes
40.Setting the Row Height of a JTree
41.All rows will be given 15 pixels of height
42.Have the row height for each row computed individually
43.Flush the internal cache of Row height
44.Preventing Expansion or Collapse of a Node in a JTree: override JTree.setExpandedState()
45.Removing a Node to a JTree Component
46.JTree root cannot be removed with removeNodeFromParent(), use DefaultTreeModel.setRoot() to remove the root
47.Listening for Expansion and Collapse Events in a JTree Component
48.Expansion and Collapse Events in a JTree are fired before a node is expanded or collapsed can be vetoed, thereby preventing the operation.
49.Creating a JTree Component
50.Changing and Removing the Default Icons in a JTree Component
51.Use UIManager to change the default icon for JTree
52.Getting the Selected Nodes in a JTree Component
53.Visiting All the Nodes in a JTree Component
54.Traverse all expanded nodes in tree
55.Finding a Node in a JTree Component
56.Search backward from last visible row looking for any visible node whose name starts with prefix.
57.Find the path regardless of visibility that matches the specified sequence of names
58.Adding a Node to a JTree Component
59.Returns a TreePath containing the specified node.
60.Converting All Nodes in a JTree Component to a TreePath Array
61.Get path for all expanded or not expanded tree pathes
62.Expanding or Collapsing All Nodes in a JTree Component
63.Preventing the Expansion or Collapse of a Node in a JTree Component
64.Listening for Selection Events in a JTree Component
65.Have a popup attached to a JTree
66.Deleting nodes from JTree
67.Adding editable nodes to JTree
68.Searching node in a JTree
69.Drag and drop of a group of files into a tree
70.JTree drag and drop utilites
71.Expand All for a tree path
72.Get tree path from TreeNode
73.JTree Utilities
74.Expand JTree