TreeTable is the combination of a tree and a table. You can use this component in order to group several rows of a table in a single row. TreeTable extends AdvancedJTable and therefore inherits all of its methods and properties. See AdvancedJTable for more information. While TreeTable makes it possible to have a tree inside a table, a TreeTableModel is the accompanying table model that creates and maintains a tree structure. TreeTableModel contains methods for determining and changing the treetable's cell values at each tree level.