// import javax.swing.tree.*;
private DefaultTreeModel m;
private DefaultMutableTreeNode act;
private void open (String s)
{
if (m == null)
{
DefaultMutableTreeNode r;
r = new DefaultMutableTreeNode (s);
m = new DefaultTreeModel (r);
jTree1.setModel (m);
act = r;
}
else
{
DefaultMutableTreeNode node;
node = new DefaultMutableTreeNode (s);
int inx = act.getChildCount();
m.insertNodeInto (node, act, inx);
act = node;
}
}
private void put (String s)
{
DefaultMutableTreeNode node;
node = new DefaultMutableTreeNode (s);
int inx = act.getChildCount();
m.insertNodeInto (node, act, inx);
}
private void close ()
{
if (act != null)
act = (DefaultMutableTreeNode) act.getParent();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
open ("Branch");
put ("item 1");
put ("item 2");
open ("Sub Branch");
put ("sub item");
close ();
put ("item 3");
close ();
}