java-首字母大小写

    /**
     * 首字母小写
     *
     * @param str
     * @return
     */
    public static String toLowerCaseFirstChar(String s) {
        if (Character.isLowerCase(s.charAt(0)))
            return s;
        else
            return (new StringBuilder())
                    .append(Character.toLowerCase(s.charAt(0)))
                    .append(s.substring(1)).toString();
    }

    /**
     * 首字母大写
     *
     * @param str
     * @return
     */
    public static String toUpperCaseFirstChar(String s) {
        if (Character.isUpperCase(s.charAt(0)))
            return s;
        else
            return (new StringBuilder())
                    .append(Character.toUpperCase(s.charAt(0)))
                    .append(s.substring(1)).toString();
    }