char ch = strChars[i];
char ch = str.charAt(i);
    public static String uncapitaliseAllWords(String str) {        int strLen;        if (str == null || (strLen = str.length()) == 0) {            return str;        }        StringBuffer buffer = new StringBuffer(strLen);        boolean whitespace = true;        char[] strChars = str.toCharArray();        for (int i = 0; i < strLen; i++) {            char ch = strChars[i];            if (Character.isWhitespace(ch)) {                buffer.append(ch);                whitespace = true;            } else if (whitespace) {                buffer.append(Character.toLowerCase(ch));                whitespace = false;            } else {                buffer.append(ch);            }        }        return buffer.toString();    }