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  3. Introduction
  4. Java Currency Formatter
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Java Currency Formatter

  • abramowicz
     + 0 comments

    I managed to adapt the solution for Java 15 and I got the correct output, but the test fails either way 😞 I double checked it with diff and it's 100% the same, including types of spaces (narrow non-breaking space vs. regular space for French formatting). I spent a lot of time investigating on how to get the correct response with NumberFormat, so I share the solution.

    The idea is based on using the DecimalFormat derived class that alllows for cusomization of many low-level aspects of the currency rendering through DecimalFormatSymbols substitution – these include the currency symbol and grouping separator that have changed in the locales between Java 8 and Java 15. The second one obviously doesn't work again, so I have to apply the substitution on the final string too, which I'm not happy with, of course. But in general it looks for me like a good answer, with one quirk. What do you think?

    Here's the code:

    import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.util.Locale;
import java.util.Scanner;

import java.util.Map;
import java.util.LinkedHashMap;

public class Solution {

    private static DecimalFormat getCurrencyFormat(Locale locale) {
        return (DecimalFormat) NumberFormat.getCurrencyInstance(locale);
    }

    private static DecimalFormat getCurrencyFormat(Locale locale, String sym, Character sep) {
        DecimalFormatSymbols symbols = new DecimalFormatSymbols(locale);
        if (sym != null) symbols.setCurrencySymbol(sym);
        if (sep != null) symbols.setGroupingSeparator(sep);
        DecimalFormat format = (DecimalFormat) NumberFormat.getCurrencyInstance(locale);
        format.setDecimalFormatSymbols(symbols);
        return format;
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double payment = sc.nextDouble();
        sc.close();

        Map<String, DecimalFormat> formats = new LinkedHashMap<>();
        formats.put("US", getCurrencyFormat(Locale.US));
        formats.put("India", getCurrencyFormat(new Locale("en", "IN"), "Rs.", null));
        formats.put("China", getCurrencyFormat(Locale.CHINA, "\uFFe5", null));
        formats.put("France", getCurrencyFormat(Locale.FRANCE, null, ' '));

        for (Map.Entry<String, DecimalFormat> entry : formats.entrySet()) {
            System.out.println(entry.getKey() + ": "
            + entry.getValue().format(payment).replace("\u202F", " "));
        }
    }
}