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<TITLE>Visiting All the Nodes in a JTree Component
(Java Developers Almanac Example)
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<h3>
e1022.
Visiting All the Nodes in a JTree Component</h3>
<pre>
// Create tree
JTree tree = new JTree();
// Add the nodes...
// Visit all nodes
visitAllNodes(tree);
// Visit only expanded nodes
visitAllExpandedNodes(tree);
// Traverse all nodes in tree
public void visitAllNodes(JTree tree) {
TreeNode root = (TreeNode)tree.getModel().getRoot();
visitAllNodes(root);
}
public void visitAllNodes(TreeNode node) {
// node is visited exactly once
<font color="#0066ff"><i>process</i></font>(node);
if (node.getChildCount() >= 0) {
for (Enumeration e=node.children(); e.hasMoreElements(); ) {
TreeNode n = (TreeNode)e.nextElement();
visitAllNodes(n);
}
}
}
// Traverse all expanded nodes in tree
public void visitAllExpandedNodes(JTree tree) {
TreeNode root = (TreeNode)tree.getModel().getRoot();
visitAllExpandedNodes(tree, new TreePath(root));
}
public void visitAllExpandedNodes(JTree tree, TreePath parent) {
// Return if node is not expanded
if (!tree.isVisible(parent)) {
return;
}
// node is visible and is visited exactly once
TreeNode node = (TreeNode)parent.getLastPathComponent();
<font color="#0066ff"><i>process</i></font>(node);
// Visit all children
if (node.getChildCount() >= 0) {
for (Enumeration e=node.children(); e.hasMoreElements(); ) {
TreeNode n = (TreeNode)e.nextElement();
TreePath path = parent.pathByAddingChild(n);
visitAllExpandedNodes(tree, path);
}
}
}
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Related Examples
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e1023. <a class="eglink" href="FindNode.html?l=rel">
Finding a Node in a JTree Component
</a>
<br>
e1024. <a class="eglink" href="AddNode.html?l=rel">
Adding a Node to a JTree Component
</a>
<br>
e1025. <a class="eglink" href="RemNode.html?l=rel">
Removing a Node to a JTree Component
</a>
<br>
e1026. <a class="eglink" href="Node2Path.html?l=rel">
Converting a Node in a JTree Component to a TreePath
</a>
<br>
e1027. <a class="eglink" href="Tree2Path.html?l=rel">
Converting All Nodes in a JTree Component to a TreePath Array
</a>
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See also:
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Layout">
Layout
</a>
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Node%20Expansion">
Node Expansion
</a>
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Selections">
Selections
</a>
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