TreeTable's table model is a TreeTableModelAdapter which interfaces between a TableModel and a TreeTableModel. TreeTable shares the JTree that is painted on the first column of the table, with this TreeTableModelAdapter.

TreeTableModel has no knowledge of row indexes, but of object nodes. The actual row index in the table is converted by TreeTableModelAdapter to a tree node. TreeTableModelAdapter retrieves the tree node with:

public Object nodeForRow(int rowIndex);

and calls TreeTableModel's corresponding method.

The table below shows the conversion that takes place for the TableModel's methods that concern a row index.