public static String addZeroForNum(String str, int strLength) {
int strLen = str.length();
if (strLen < strLength) {
while (strLen < strLength) {
StringBuffer sb = new StringBuffer();
sb.append("0").append(str);// left+0
// sb.append(str).append("0");//right+0
str = sb.toString();
strLen = str.length();
}
}
return str;
}
addZeroForNum(字符串, size(用于判断不够长时补0))