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<TITLE>Finding a Node in a JTree Component (Java Developers Almanac Example)
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<h1>The Java Developers Almanac 1.4</h1>
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    <A HREF="../javax.swing.tree/pkg.html">javax.swing.tree</A><font color="#666666" class="xsmall-font">
        &nbsp;[15 examples]
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        <B><A HREF="../javax.swing.tree/pkg.html#Nodes">Nodes</A></B><font color="#666666" class="xsmall-font">
            &nbsp;[6 examples]
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  <h3>e1024. Finding a Node in a JTree Component</h3>



<pre>    // Create tree
    JTree tree = new JTree();
    
    // Search forward from first visible row looking for any visible node
    // whose name starts with prefix.
    int startRow = <font color="#0066ff"><i>0</i></font>;
    String prefix = <font color="#0066ff"><i>"b"</i></font>;
    TreePath path = tree.getNextMatch(prefix, startRow, Position.Bias.Forward);
    
    // Search backward from last visible row looking for any visible node
    // whose name starts with prefix.
    startRow = <font color="#0066ff"><i>tree.getRowCount()-1</i></font>;
    prefix = <font color="#0066ff"><i>"b"</i></font>;
    path = tree.getNextMatch(prefix, startRow, Position.Bias.Backward);
    
    // Find the path (regardless of visibility) that matches the
    // specified sequence of names
    path = findByName(tree, <font color="#0066ff"><i>new String[]{"JTree", "food", "bananas"}</i></font>);
    
    // Finds the path in tree as specified by the node array. The node array is a sequence
    // of nodes where nodes[0] is the root and nodes[i] is a child of nodes[i-1].
    // Comparison is done using Object.equals(). Returns null if not found.
    public TreePath find(JTree tree, Object[] nodes) {
        TreeNode root = (TreeNode)tree.getModel().getRoot();
        return find2(tree, new TreePath(root), nodes, 0, false);
    }
    
    // Finds the path in tree as specified by the array of names. The names array is a
    // sequence of names where names[0] is the root and names[i] is a child of names[i-1].
    // Comparison is done using String.equals(). Returns null if not found.
    public TreePath findByName(JTree tree, String[] names) {
        TreeNode root = (TreeNode)tree.getModel().getRoot();
        return find2(tree, new TreePath(root), names, 0, true);
    }
    private TreePath find2(JTree tree, TreePath parent, Object[] nodes, int depth, boolean byName) {
        TreeNode node = (TreeNode)parent.getLastPathComponent();
        Object o = node;
    
        // If by name, convert node to a string
        if (byName) {
            o = o.toString();
        }
    
        // If equal, go down the branch
        if (o.equals(nodes[depth])) {
            // If at end, return match
            if (depth == nodes.length-1) {
                return parent;
            }
    
            // Traverse children
            if (node.getChildCount() &gt;= 0) {
                for (Enumeration e=node.children(); e.hasMoreElements(); ) {
                    TreeNode n = (TreeNode)e.nextElement();
                    TreePath path = parent.pathByAddingChild(n);
                    TreePath result = find2(tree, path, nodes, depth+1, byName);
                    // Found a match
                    if (result != null) {
                        return result;
                    }
                }
            }
        }
    
        // No match at this branch
        return null;
    }
</pre>
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            &nbsp;<b>Related Examples</b></font></td>
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e1023. <a class="eglink" href="GetNodes.html?l=rel">
    Visiting All the Nodes in a JTree Component
</a>
<br>

e1025. <a class="eglink" href="AddNode.html?l=rel">
    Adding a Node to a JTree Component
</a>
<br>

e1026. <a class="eglink" href="RemNode.html?l=rel">
    Removing a Node to a JTree Component
</a>
<br>

e1027. <a class="eglink" href="Node2Path.html?l=rel">
    Converting a Node in a JTree Component to a TreePath
</a>
<br>

e1028. <a class="eglink" href="Tree2Path.html?l=rel">
    Converting All Nodes in a JTree Component to a TreePath Array
</a>
<br>


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<br>
        See also: 
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Events">
    Events
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Layout">
    Layout
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Node%20Expansion">
    Node Expansion
</a>&nbsp;&nbsp;

<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Selections">
    Selections
</a>&nbsp;&nbsp;

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