public String getAmountByTransactionType(String transactionType) {

    Double amount = 0D;
    for (ExpenseData smsData : this.smsList) {

      if (transactionType.equalsIgnoreCase(smsData.getTransactionType())) {

        amount = amount + Double.valueOf(smsData.getAmount());
      }
    }
    return amount.toString();
  }