public String trim() {

        int len = value.length;

        int st = ;

        char[] val = value;    /* avoid getfield opcode */

        while ((st < len) && (val[st] <= ' ')) {

            st++;

        }

        while ((st < len) && (val[len - ] <= ' ')) {

            len--;

        }

        return ((st > ) || (len < value.length)) ? substring(st, len) : this;

    }