GroupTableColumnModel defines the requirements for a table column model object suitable for use with a GroupTableHeader. This interface defines methods for adding/removing GroupTableColumnModelListeners that are notified each time a group column is added or removed from the model.

The root group column is retrieved with:

public GroupTableColumn getRootGroupColumn();

You can use this root group column to add group columns to the model:

GroupTableColumn root = model.getRootGroupColumn();

GroupTableColumn gtc = new GroupTableColumn("Name");

gtc.addColumn(table.getColumnModel().getColumn(0));

gtc.addColumn(table.getColumnModel().getColumn(1));

root.addColumn(gtc);