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    <p>Yes, <code>Locale.ENGLISH</code> is a safe choice for case operations for things like programming language identifiers and URL parts since it doesn't involve any special casing rules and all 7-bit ASCII characters in the ENGLISH case-convert to 7-bit ASCII characters.</p> <p>That is not true for all other locales. In Turkish, the 'I' and 'i' characters are not case-converted to one another.</p> <p><a href="http://en.wikipedia.org/wiki/Dotted_and_dotless_I" rel="nofollow">"Dotted and dotless I"</a> explains:</p> <blockquote> <p>The Turkish alphabet, which is a variant of the Latin alphabet, includes two distinct versions of the letter I, one dotted and the other dotless.</p> <p>In Unicode, U+0131 is a lower case letter dotless i (ı). U+0130 (İ) is capital i with dot. ISO-8859-9 has them at positions 0xFD and 0xDD respectively. In normal typography, when lower case i is combined with other diacritics, the dot is generally removed before the diacritic is added; however, Unicode still lists the equivalent combining sequences as including the dotted i, since logically it is the normal dotted i character that is being modified.</p> <p>Most Unicode software uppercases ı to I and lowercases İ to i, but, unless specifically set up for Turkish, it lowercases I to i and uppercases i to I. Thus uppercasing then lowercasing, or vice versa, changes the letters.</p> </blockquote> <p>The list of special exceptions is maintained at <a href="http://unicode.org/Public/UNIDATA/SpecialCasing.txt" rel="nofollow">http://unicode.org/Public/UNIDATA/SpecialCasing.txt</a></p> <blockquote> <pre><code># ================================================================================ # Turkish and Azeri # I and i-dotless; I-dot and i are case pairs in Turkish and Azeri # The following rules handle those cases. 0130; 0069; 0130; 0130; tr; # LATIN CAPITAL LETTER I WITH DOT ABOVE 0130; 0069; 0130; 0130; az; # LATIN CAPITAL LETTER I WITH DOT ABOVE # When lowercasing, remove dot_above in the sequence I + dot_above, which will turn into i. # This matches the behavior of the canonically equivalent I-dot_above 0307; ; 0307; 0307; tr After_I; # COMBINING DOT ABOVE 0307; ; 0307; 0307; az After_I; # COMBINING DOT ABOVE </code></pre> <p>...</p> </blockquote>
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    1. POWhich Locale should I specify when I call String toLowerCase
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    1. USMike Samuel
    1. USMike Samuel
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    1. POWhich Locale should I specify when I call String toLowerCase
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    1. CO"That is not true for all other locales", which can not use ASCII.
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    2. COIn what circumstances would you use the ROOT locale? I have been using that to mean that I don't want to have any special case case-folding applied.
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      1. USmchr
    3. CO@Raedwald, I'm not sure I understand. Could you please expand on your comment?
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