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

public class Cldr { 
   
  public static void main(String[] args) { 
    Locale deCH = new Locale("de", "CH"); 
    NumberFormat nf = NumberFormat.getInstance(deCH); 
     
    String expected = "54'839'483.142"; // i.e. "." as decimal separator, "'" as grouping separator 
    String actual = nf.format(54839483.1415); 
    System.out.println("correct for de_CH: " + expected + " vs. actual " + actual); 
  } 
   
}