Method foldCase

vm/JavaAPI/src/java/lang/String.java:647–655

This isn't equivalent to either of ICU's u_foldCase case folds, and thus any of the Unicode case folds, but it's what the RI uses.

(char ch)

     * case folds, but it's what the RI uses.
     */
    private char foldCase(char ch) {
        if (ch < 128) {
            if ('A' <= ch && ch <= 'Z') {
                return (char) (ch + ('a' - 'A'));
            }
            return ch;
        }
        return Character.toLowerCase(Character.toUpperCase(ch));
    }

    /**
     * Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.