ObjectTreeTableModel is a treetable model whose nodes' cell value depends on the user object attribute of a DefaultMutableTreeNode.

The user object is retrieved with DefaultMutableTreeNode's method:

public Object getUserObject();

Then, the user object is passed to the method:

public Object getObjectAt(Object userObject, int column);

, so that to return a value for the specific treetable cell.

ObjectTreeTableModel is an abstract class. Subclasses need only provide the column names and classes and implement the getObjectAt method described above.