Method trimStart

src/main/java/utils/Util.java:311–329

将字符串开头空格去掉 @param str @return

(String str)

     * @return
     */
    public static String trimStart(String str) {
        if (str == "" || str == null) {
            return str;
        }

        final char[] value = str.toCharArray();
        int start = 0, last = 0 + str.length();
        int end = last;
        while ((start <= end) && (value[start] <= ' ')) {
            start++;
        }
        if (start == 0 && end == last) {
            return str;
        }
        if (start >= end) {
            return "";
        }
        return str.substring(start, end);
    }
}