The HTMLTableHeader class inherits from the HTMLTableCell class. It creates a specific type of cell, the header cell, giving you a <th> cell instead of a <td> cell. Like the HTMLTableCell class, you call various methods in order to update or retrieve attributes of the header cell.
The following is an example for HTMLTableHeader:
// Create the table headers.
HTMLTableHeader account_header = new HTMLTableHeader(new HTMLText("ACCOUNT"));
HTMLTableHeader name_header = new HTMLTableHeader(new HTMLText("NAME"));
HTMLTableHeader balance_header = new HTMLTableHeader();
HTMLText balance = new HTMLText("BALANCE");
balance_header.setElement(balance);
// Add the table headers to an HTMLTable object (assume that the table already exists).
table.addColumnHeader(account_header);
table.addColumnHeader(name_header);
table.addColumnHeader(balance_header);