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Artur> http://www.pg.gda.pl/~abies/tests/ Artur> file CharacterTest.java I ran this against libjava. It found a couple bugs in libjava (we implemented the deprecated methods incorrectly, and we didn't compute the titlecase of a titlecase character correctly). So it has already helped -- thanks. I still have some divergences. The ones I've looked at all appear to be bugs in the test code, and not libjava. For instance, the program reports this: Character 00AA:FEMININE ORDINAL INDICATOR incorectly reported as not-lowercase However, this is incorrect. The Java Class Libraries book says that isLowerCase() returns true if and only iff: * ch < 0x2000 or ch > 0x2fff * Unicode does not specify a lowercase mapping for ch * Unicode specifies an uppercase mapping for ch, or the Unicode name contains "SMALL LETTER" or "SMALL LIGATURE" However, you can see that #3 does not apply for this character from the Unicode table entry: 00AA;FEMININE ORDINAL INDICATOR;Ll;0;L;<super> 0061;;;;N;;;;; (The last 3 fields are the case mappings.) See http://java.sun.com/products/jdk/1.2/docs/api/java/lang/Character.html for all the details on how the methods are specified. I believe all the other libjava tests represent failures in the test code, but of course I haven't checked them all. A quick glance seems to indicate they are all upper/lower test failures. Tom