myeclipse6.0以上注册程序

package server;   
  
import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
public class dd { 
private static final String LL = "Decompiling this copyrighted software is a violation of both your license agreement and the Digital Millenium Copyright Act of 1998 (http://www.loc.gov/copyright/legislation/dmca.pdf). Under section 1204 of the DMCA, penalties range up to a $500,000 fine or up to five years imprisonment for a first offense. Think about it; pay for a license, avoid prosecution, and feel better about yourself."; 
public String getSerial(String userId, String licenseNum) { 
  java.util.Calendar cal = java.util.Calendar.getInstance(); 
  cal.add(1, 3); 
  cal.add(6, -1); 
  java.text.NumberFormat nf = new java.text.DecimalFormat("000"); 
  licenseNum = nf.format(Integer.valueOf(licenseNum)); 
  String verTime = new StringBuilder("-").append( 
    new java.text.SimpleDateFormat("yyMMdd").format(cal.getTime())) 
    .append("0").toString(); 
  String type = "YE3MP-"; 
  String need = new StringBuilder(userId.substring(0, 1)).append(type) 
    .append("300").append(licenseNum).append(verTime).toString(); 
  String dx = new StringBuilder(need).append(LL).append(userId) 
    .toString(); 
  int suf = this.decode(dx); 
  String code = new StringBuilder(need).append(String.valueOf(suf)) 
    .toString(); 
  return this.change(code); 
} 
private int decode(String s) { 
  int i; 
  char[] ac; 
  int j;