import javax.swing.*;
import javax.swing.tree.*;

class TreeTest extends JFrame {

    TreeTest () {
	setSize(400,400);

	// The node tree is build from objects of DefaultMutableTreeNode

	DefaultMutableTreeNode root =  new DefaultMutableTreeNode("World");

	DefaultMutableTreeNode africa = new DefaultMutableTreeNode("Africa");
	DefaultMutableTreeNode usa = new DefaultMutableTreeNode("USA");

	root.add(africa);
	root.add(usa);

	usa.add(new DefaultMutableTreeNode("New York"));
	usa.add(new DefaultMutableTreeNode("Oregon"));
	usa.add(new DefaultMutableTreeNode("Florida"));

	africa.add(new DefaultMutableTreeNode("Botswana"));
	africa.add(new DefaultMutableTreeNode("Gambia"));

	DefaultMutableTreeNode tanzania = new DefaultMutableTreeNode("Tanzania");
	africa.add(tanzania);

	tanzania.add(new DefaultMutableTreeNode("Kilimanjaro"));
	tanzania.add(new DefaultMutableTreeNode("Dodoma"));
	tanzania.add(new DefaultMutableTreeNode("Dar es-Salaam"));

	DefaultTreeModel model = new DefaultTreeModel(root); // model needs a tree of nodes 

	JTree tree = new JTree(model);   // JTree needs a model
	add(tree);                       // add to frame
	setVisible(true);
	setDefaultCloseOperation(EXIT_ON_CLOSE);
    }

    public static void main(String[] u) {
	new TreeTest();
    }
}