The NumberFormat Class : Formatter « Utility Classes « SCJP

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SCJP » Utility Classes » Formatter 
8.25.18.The NumberFormat Class
import java.text.NumberFormat;
import java.util.Locale;

public class MainClass {
  public static void main(String[] argv) {
    float f1 = 123.4567f;
    Locale locFR = new Locale("fr")// France
    NumberFormat[] nfa = new NumberFormat[4];

    nfa[0= NumberFormat.getInstance();
    nfa[1= NumberFormat.getInstance(locFR);
    nfa[2= NumberFormat.getCurrencyInstance();
    nfa[3= NumberFormat.getCurrencyInstance(locFR);

    for (NumberFormat nf : nfa)
      System.out.println(nf.format(f1));

  }
}
123.457
123,457
$123.46
123,46
8.25.Formatter
8.25.1.%b Formats a boolean value (wrapper or primitive)
8.25.2.%c Formats a character
8.25.3.%d Formats an integer
8.25.4.%f Formats a floating-point number
8.25.5.%s Formats an object, generally by calling its toString() method
8.25.6.By default, arguments are formatted in their order of appearance in Formatter.
8.25.7.Stick a number and then a dollar sign ($) immediately after the % sign to set the order
8.25.8.Justified a field with Formatter
8.25.9.Control the number of characters that will appear to the right of the decimal point: %w.df
8.25.10.Internationalization and Formatter
8.25.11.Formatting Dates with java.text.DateFormat
8.25.12.Prints out a date in each of the four formats. (The locale is the U.S.)
8.25.13.DateFormat.getDateInstance() accepts a style and a locale.
8.25.14.Formatting Numbers and Currency
8.25.15.To format currency, call NumberFormat.getCurrencyInstance().
8.25.16.The Locale Class
8.25.17.Create Strings that represent a given locale's country and language in terms of both the default locale and any other locale:
8.25.18.The NumberFormat Class
8.25.19.Use getMaximumFractionDigits(), setMaximumFractionDigits(), parse(), and setParseIntegerOnly():
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