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