Here is just a couple of snippets of code. The program allows a negative deposit

Question

Here is just a couple of snippets of code. The program allows a negative deposit. How would I fix this? If you need all of the code just comment with ur email and I can give you whole code. I just figured it was to lengthy to post it all here.

private static void depositMoney(ArrayList<BankAccount> list) {
  int index= -1;
  do{
  int number = accountNumber();
  index = accountNumberExist(list, number);
  if (index == -1) {
   System.out.println("The account number " + number + " is not found!");
  } else {
   System.out.print("Enter money to deposit: $");
   BigDecimal money = ammount();
   list.get(index).deposit(money);
   System.out.println("Account Number: " + list.get(index).getAccountNumber());
   System.out.println("Current Balance: $" + new DecimalFormat("0.00").format((list.get(index).getBalance())));
  }
  }while(index==-1);
}
public static BigDecimal ammount() {
  BigDecimal money = BigDecimal.ZERO;
  boolean exceptionFlag = true;
  do {
   exceptionFlag = true;
   try {
    String inputAmount = input.nextLine();
    money = new BigDecimal(inputAmount);
    int decimalIndex = inputAmount.indexOf('.');
    String temp = inputAmount.substring(decimalIndex + 1);
    if (decimalIndex != -1)
     if (!(temp.length() == 2)) {
      exceptionFlag = false;
      System.out.print("Enter valid amount (2 didit after decimal): ");
     }
   } catch (Exception e) {
    System.out.print("Enter valid amount: ");
    exceptionFlag = false;
   }
  } while (exceptionFlag == false);

  return money;
}
}

Explanation / Answer

change your amount method as follows

public static BigDecimal ammount() {
BigDecimal money = BigDecimal.ZERO;
boolean exceptionFlag = true;
do {
       exceptionFlag = true;
       try {
           String inputAmount = input.nextLine();
           if(inputAmount.indexOf('-') == 0)
           {
               exceptionFlag = false;
           }
           
           else
           {

                money = new BigDecimal(inputAmount);
               int decimalIndex = inputAmount.indexOf('.');
               String temp = inputAmount.substring(decimalIndex + 1);
               if (decimalIndex != -1)
                   if (!(temp.length() == 2)) {
                       exceptionFlag = false;
                       System.out.print("Enter valid amount (2 digit after decimal): ");
               }
           }
       }
       catch (Exception e) {
           System.out.print("Enter valid amount: ");
           exceptionFlag = false;
       }
      } while (exceptionFlag == false);

return money;
}

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