输入结果 00000000000567   String bala="567";   固定长度是14位，怎么循环在bala前面填充00000000000System.out.println("---www.yq1012.com--------");String bala = "567";        StringBuffer sb = new StringBuffer(17);        sb.append(bala);        while (sb.length() < 17) {            sb.insert(0, 0);        }        System.out.println(sb.toString());