You create and install a GroupTableHeader as you normally would with a JTableHeader:

GroupTableHeader gth = new GroupTableHeader();

JTable table = new JTable();

table.setTableHeader(gth);

Then you can use GroupTableHeader's methods:

public void addGroupColumn(GroupTableColumn aColumn);

public void removeGroupColumn(GroupTableColumn aColumn);

, in order to add/remove column groups.

AdvancedJTable creates its own GroupTableHeader subclass, AdvancedJTable.InnerTableHeader. Therefore, you need not and should not set a GroupTableHeader if you are using AdvancedJTable.

Example 1: Usage of GroupTableHeader with a JTable

GroupTableHeader groupHeader = new GroupTableHeader();

GroupTableColumn nameColumn = new GroupTableColumn("Name");

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

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

groupHeader.addGroupColumn(nameColumn);

table.setTableHeader(groupHeader);

Example 2: Usage of GroupTableHeader with AdvancedJTable

GroupTableHeader groupHeader = (GroupTableHeader) table.getTableHeader();

GroupTableColumn nameColumn = new GroupTableColumn("Name");

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

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

groupHeader.addGroupColumn(nameColumn);