DefaultMutableTreeNode r = new DefaultMutableTreeNode( "TreeT" ); DefaultMutableTreeNode c11 = new DefaultMutableTreeNode( "C1.1" ); DefaultMutableTreeNode c12 = new DefaultMutableTreeNode( "C1.2" ); JTree00 t = new JTree00( r ); JTree00 t = new JTree00( r2 ); t.addObject( r, p1 ); t.addObject( r, p2 ); t.addObject( p1, c11 ); t.addObject( p1, c12 );