converting ß.cfg to upper case using toUpperCase() in java

Question

I am trying following code

String s1 = "ß.cfg";
System.out.println (s.toUpperCase());

output I am getting is SS.CFG since Unicode didn't define an uppercase version of ß while I want the output as ß.CFG.

Is there any way I can achieve that?

Answer 1

"ß" character is equivalent to "ss" (used in German, for example), and this is defined so in your Locale (the Locale you are using in your app).

You can try to do some experiment with a different Locale using method:

toUpperCase(Locale locale) 

Edit: As the user said, this method is not valid, a possible workaroud (not very elegant) is:

    String s1 = new String ("auß.cfg").replace('ß', '\u9999');
    System.out.println (s1.toUpperCase(Locale.UK).replace('\u9999', 'ß'));

Answer 2

The documentation for toUpperCase( Locale ) explicitly states that this is what will happen:

Since case mappings are not always 1:1 char mappings, the resulting String may be a different length than the original String.

small letter sharp s -> two letters: SS