public final String subString(int offset, int count) {
        if (ASMUtils.IS_ANDROID) {
            if (count < sbuf.length) {
                text.getChars(offset, offset + count, sbuf, 0);
                return new String(sbuf, 0, count);
            } else {
                char[] chars = new char[count];
                text.getChars(offset, offset + count, chars, 0);
                return new String(chars);
            }
        } else {
            return text.substring(offset, offset + count);
        }
    }
The value of a literal token, recorded as a string. For integers, leading 0x and 'l' suffixes are suppressed.
src/main/java/com/alibaba/fastjson/parser/JSONScanner.java