How to Customize Decimal and Grouping Separators in DecimalFormat?

How to Alter Decimal Separator in DecimalFormat

In your provided formatBigDecimal method, you aim to convert BigDecimal values into readable strings. However, the method adds an unwanted grouping separator (",") resembling European number formats. You seek a method to replace this separator with a dot or point.

Locale-Based Approach

One approach is to define a specific locale that uses a period as the grouping separator. For instance, the German locale uses this format:

Locale currentLocale = Locale.getDefault();
NumberFormat nf = NumberFormat.getNumberInstance(Locale.GERMAN);
DecimalFormat df = (DecimalFormat)nf;

DecimalFormatSymbols Modification

Another option involves altering the DecimalFormatSymbols, which define symbols used in formatting numbers, including decimal and grouping separators. Here's how:

DecimalFormatSymbols otherSymbols = new DecimalFormatSymbols(currentLocale);
otherSymbols.setDecimalSeparator(',');
otherSymbols.setGroupingSeparator('.');
DecimalFormat df = new DecimalFormat(formatString, otherSymbols);

where formatString represents the desired number format pattern.

Additional Considerations

To account for varying local number representations, you can implement a mechanism to determine the appropriate locale based on the user's settings or the context of the application. This approach ensures that the decimal and grouping separators are displayed as expected in different regions.

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