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[] argv) throws Exception {
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root Label");
root.add(new DefaultMutableTreeNode("Node Label"));
JTree tree = new JTree(root);
JFrame f = new JFrame();
f.add(new JScrollPane(tree));
f.setSize(300,300);
f.setVisible(true);
}
}