为什么得到字符的总是空值？

Question

package com.retrospect;

import java.text.ParseException;

import com.rockontrol.origin.server.traceabilitycode.TraceabilityCode;

public class Retrospect {

/**

* 

* @param district 区域行政编码

* @param bodynum   4位平台编码

* @param db       地理标示

* @param rzlx   认证类型

* @param gaprz GAP认证

* @param jdrz 基地认证

* @return

*/

public String Ascend(String district,String bodynum,String db,String rzlx,String gaprz,String jdrz){

TraceabilityCode t = new TraceabilityCode();

String number = null;

try {

number  = t.getCode("140100","1234","1","1","1","1");

} catch (ParseException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return number;

}

public static void main(String[] args) {

String num =new Retrospect().Ascend(null, null, null, null, null, null);

System.out.println(num);

}

}

Answer 1

TraceabilityCode 是什么