package com.test4;
public class Test7 {
public static void main(String[] args) {
System.out.println(getNum("20100505",3));
}
//假设数据库里有个20100505005的编号
private static String getNum(String firstPart, int len) {
//调用数据库获得20100505005这个编号
String oldNum = "20100505005";
int num = Integer.parseInt(oldNum.replace(firstPart,""));
String numStr = ++num +"";
int length = numStr.length();
for (int i = length; i < len; i++) {
numStr = "0"+numStr;
}
return firstPart + numStr;
}
}
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