Construct the object including its GUI
super("JTreeDemo");
Container cp = getContentPane();
cp.setLayout(new BorderLayout());
root = new DefaultMutableTreeNode("root");
child = new DefaultMutableTreeNode("Colors");
root.add(child);
child.add(new DefaultMutableTreeNode("Cyan"));
child.add(new DefaultMutableTreeNode("Magenta"));
child.add(new DefaultMutableTreeNode("Yellow"));
child.add(new DefaultMutableTreeNode("Black"));
myTree = new JTree(root);
cp.add(BorderLayout.CENTER, myTree);
cp.add(BorderLayout.NORTH, addButton = new JButton("Add"));
addButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// Insert more nodes into the tree
child = new DefaultMutableTreeNode("Flavors");
child.add(new DefaultMutableTreeNode("Java"));
child.add(new DefaultMutableTreeNode("Espresso"));
child.add(new DefaultMutableTreeNode("Hey Joe!"));
child.add(new DefaultMutableTreeNode("Charcoal"));
child.add(new DefaultMutableTreeNode("Paint Remover"));
// Notify the model, which will add it and create an event, and
// send it up the tree...
((DefaultTreeModel)myTree.getModel()).insertNodeInto(child, root, 0);
}
});
cp.add(BorderLayout.SOUTH, quitButton = new JButton("Exit"));
quitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
dispose();
System.exit(0);
}
});
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(false);
dispose();
System.exit(0);
}
});
pack();
