@Override public Object getValueAt(int row, int col) { Staff employee = employees.get(row); switch (col) { case NAME: return employee.getName(); case NATINAL_ID_NUM: return employee.getNational_id_num(); case STAFF_ID: return employee.getStaff_id(); case RANK: return employee.getRank(); case OBJECT_COL: return employee; default: return employee.getName(); } }