Parsing string to double - java

Question

For a project I have a program that is like a bank. The "bank" reads in a file with accounts in it that look like this:
Miller
William
00001
891692 06 <----string that needs to be converted to double
The last string has to be converted to a double so that the program can perform calculations on it like addition and subtraction, etc.
And also I have to print it out in monetary format, i.e. $891692.06

I have this so far:

 public class Account {
      private String firstName, lastName;
      private int accountID;
      private String currentBalance; 

      private static int maxAccountID;

      public Account(String fN, String lN, int acct, String bal) {
         firstName = fN; lastName = lN;
         accountID = acct;
         currentBalance = bal;
         if(accountID > Account.maxAccountID)
            Account.maxAccountID = accountID;
      }     

  public double getBalance(){
        String [] s = currentBalance.split(" ");
        String balStr = "$"+s[0]+"."+s[1];
            double currentBalance = Double.parseDouble(balStr);
         return currentBalance;
      }
}

Thanks in advance!

What exactly is your question? In your code already you convert a String to a double with `Double.parseDouble(balStr)` — adchilds, Oct 31 '12 at 19:50

score 14 · Accepted Answer · answered Oct 31 '12 at 19:52

14

If your string representing double uses space ' ' instead of a decimal point, you can fix it by replacing the space with a dot, like this:

String currentBalanceStr = "891692 06";
double currentBalanceDbl = Double.parseDouble(currentBalanceStr.replaceAll(" ","."));

Link to ideone.

answered Oct 31 '12 at 19:52

Sergey Kalinichenko

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With this it's returning the amounts as '0.0' – Gcap Oct 31 '12 at 19:58
@Gcap That is strange. Did you follow the link to see if your code does the same thing as mine? – Sergey Kalinichenko Oct 31 '12 at 19:59
Yes it looked at that.. the thing is that I have a string being inputted through currentBalanceStr from another class – Gcap Oct 31 '12 at 20:04
@Gcap You should print `currentBalanceStr` to see its value before calling `parseDouble` then. – Sergey Kalinichenko Oct 31 '12 at 20:07
Nvmd its working lol but when the String is say "891692 60" it cuts off the 0 at the end, do you know of any way I can keep it? – Gcap Oct 31 '12 at 20:13
@Gcap Use `DecimalFormat`. Take a look at [this link](http://ideone.com/6CsjWg) for a modified example. Don't forget to import `java.text.*` to use `DecimalFormat`. – Sergey Kalinichenko Oct 31 '12 at 20:17
will it still be kept as type double if I do that? – Gcap Oct 31 '12 at 20:19
@Gcap The type in which you keep it is up to you. The last two lines of the example simply format the value with two characters at the end; they have nothing to do with storing it. – Sergey Kalinichenko Oct 31 '12 at 20:25

score 4 · Answer 2 · answered Oct 31 '12 at 20:09

Using Double for balance calculation is not a good idea, it makes more sense to use the BigDecimal because it is more precise.

You can also add the currency using the class bellow:

Locale enUSLocale =
    new Locale.Builder().setLanguage("en").setRegion("US").build();

Currency currencyInstance = Currency.getInstance(enUSLocale);

System.out.println(
    "Symbol for US Dollar, en-US locale: " +
    currencyInstance.getSymbol(enUSLocale));

please go through this link for more details.

Not allowed to use BigDecimal in this project – Gcap Oct 31 '12 at 20:25 — Gcap, Oct 31 '12 at 20:25

score 3 · Answer 3 · answered Jan 24 '14 at 10:51

3

It seems like you are doing some currency calculation, so always use BigDecimal

BigDecimal balStr = new BigDecimal(String.replaceAll(" ",".");

answered Jan 24 '14 at 10:51

Suganthan Madhavan Pillai

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Good idea to use BigDecimal for precision calculations – hyper-neutrino Jun 10 '15 at 17:56

score 0 · Answer 4 · edited Mar 04 '20 at 22:34

0

String s="891692 06";
Double.parseDouble(s.replace(" ", ".")); would do the trick

You can use NumberFormatClass from the API to get the monetary information.

edited Mar 04 '20 at 22:34

soz

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answered Oct 31 '12 at 19:49

PermGenError

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Parsing string to double - java

4 Answers4

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