Create Dynamic node for JTree in Java
Description
The following code shows how to create Dynamic node for JTree.
The JTree class has an inner class, JTree.DynamicUtilTreeNode. The JTree uses it to create the nodes for your trees.
The DynamicUtilTreeNode is a DefaultMutableTreeNode subclass.
The DynamicUtilTreeNode doesn't create its child nodes until they're needed.
The child nodes are needed when you either expand the parent node or try to traverse a tree.
Example
/*ww w . j a va2 s. c o m*/
import java.awt.BorderLayout;
import java.util.Hashtable;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
public class Main {
public static void main(String args[]) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
Hashtable<String, Object> hashtable = new Hashtable<String, Object>();
hashtable.put ("java2s.com", new String[]{"A", "B", "C"});
Hashtable<Object, Object> innerHashtable = new Hashtable<Object, Object>();
innerHashtable.put ("Two", new String[]{"A", "B", "C"});
hashtable.put ("Three", innerHashtable);
JTree.DynamicUtilTreeNode.createChildren(root, hashtable);
JTree tree = new JTree(root);
JScrollPane scrollPane = new JScrollPane(tree);
frame.add(scrollPane, BorderLayout.CENTER);
frame.setSize(300, 150);
frame.setVisible(true);
}
}
The code above generates the following result.
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