How to properly display a price up to two decimals (cents) including trailing zeros in Java?

Question

There is a good question on rounding decimals in Java here. But I was wondering how can I include the trailing zeros to display prices in my program like: $1.50, $1.00

T

Answer 1

While others answers are perfectly valid (especially duffymo's one), you have a much bigger problem than formatting the display. You are actually using a totally wrong type for a money amount which is a discrete value. Instead of a double, you should really consider using a java.lang.BigDecimal.

(EDIT: ... or a well implemented Money class as duffymo pointed out in a comment, for example classes from JScience's monetary module or the more recent Joda-Money - which has still to be released as an official version.)

Answer 2

public static String getFormattedData(String actualString) 
    {
        String subString = "0.0";

        if(actualString.contains("."))
        {   
            subString = actualString.substring(actualString.indexOf("."), actualString.trim().length()); 

            if(Double.parseDouble(subString) > 0.0)
                return actualString;
            else
                actualString = actualString.substring(0, actualString.indexOf("."));
        }
        return actualString;
    }

Answer 3

I would recommend that you do this:

NumberFormat currencyFormatter = NumberFormat.getCurrencyInstance();
double price = 2.50000000000003;
System.out.println(currencyFormatter.format(price));

This has the virtue of be locale-specific as well. This will work, for example, if you're in the euro zone instead of the US.

Answer 4

It can probably be done with String.format(...), but you could use DecimalFormat:

double price = 2.50000000000003;
DecimalFormat formatter = new DecimalFormat("$0.00");
System.out.println(formatter.format(price)); // print: $2.50

Answer 5

Have you tried:

String s = String.format("$%.2f", 2.50);

That will do the trick.