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 U

Answer 1

The Java implementation is simply following what the Unicode specification says. And Unicode says this:

# ================================================================================
# Unconditional mappings
# ================================================================================

# The German es-zed is special--the normal mapping is to SS.
# Note: the titlecase should never occur in practice. It is equal to titlecase(uppercase())

00DF; 00DF; 0053 0073; 0053 0053; # LATIN SMALL LETTER SHARP S

Reference: http://unicode.org/Public/UNIDATA/SpecialCasing.txt

If you want to implement a form of uppercase conversion that is different to Unicode, you'll need to specify and implement it yourself.

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_{(If you want to see a bunch of people getting hot under the collar about "uppercase ß", read this email thread - http://unicode.org/mail-arch/unicode-ml/y2007-m05/0007.html )}