The NumberFormat Class : 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) {
    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