in this code how object values bind in arrylist from cursor

public ArrayList<Object> getOrderInvoiceHeaders(String query) {

OutOrderOrInvoiceHeaderDO headerDO = null;

ArrayList<Object> arrayList = null;
try {
		arrayList = new ArrayList<Object>();
		headerDO = new OutOrderOrInvoiceHeaderDO();
			Global.dbObj.openDataBase();

			Cursor cursor = Global.dbObj.execQuery(query);
			if (cursor != null) {
				while (cursor.moveToNext()) {

					headerDO.docNumber = (String.valueOf(cursor
							.getString(cursor.getColumnIndex("DocNumber"))));
					headerDO.customerNumber = (String.valueOf(cursor
							.getInt(cursor.getColumnIndex("CustomerNumber"))));
					headerDO.grossSales = (String.valueOf(cursor.getInt(cursor
							.getColumnIndex("GrossSales"))));
					headerDO.totalTaxes = (String.valueOf(cursor.getInt(cursor
							.getColumnIndex("TotalTaxes"))));
					headerDO.netAmount = (String.valueOf(cursor.getInt(cursor
							.getColumnIndex("NetAmount"))));
					headerDO.routeNumber = (String.valueOf(cursor
							.getString(cursor.getColumnIndex("RouteNumber"))));
					headerDO.employeeNumber = (String
							.valueOf(cursor.getString(cursor
									.getColumnIndex("EmployeeNumber"))));
				}

			}
			cursor.close();

			System.out.println(arrayList.size());

		} catch (Exception e) {
			e.printStackTrace();
		} finally {
			Global.dbObj.close();
		}
		return arrayList;
	}