To format currency, call NumberFormat.getCurrencyInstance(). : Formatter « Utility Classes « SCJP

1. SCJP
2. Utility Classes
3. Formatter

import java.text.NumberFormat;
import java.util.Locale;

public class MainClass{
    public static void main(String[] argv){
        Locale[] locales = { Locale.US, Locale.TAIWAN };
        for (Locale loc:locales) {
          NumberFormat f = NumberFormat.getCurrencyInstance(loc);
          String formattedMoney = f.format(123.45);
          System.out.format("%15s: %s\n",
                              loc.getDisplayCountry(),
                              formattedMoney);
        }
    }
}

United States: $123.45
         Taiwan: NT$123.45