MyEclipse5.5.1GA版本注册机

import java.io.*;    
public class MyEclipseGen {    
   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.";//定义一个String字符串    
   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;    
       int k;    
       i = 0;    
       ac = s.toCharArray();    
       j = 0;    
       k = ac.length;    
       while (j < k) {    
           i = (31 * i) + ac[j];    
           j++;    
       }    
       return Math.abs(i);    
   }    
  
   private String change(String s) {    
       byte[] abyte0;    
       char[] ac;    
       int i;    
       int k;    
       int j;    
       abyte0 = s.getBytes();    
       ac = new char[s.length()];    
       i = 0;    
       k = abyte0.length;    
       while (i < k) {    
           j = abyte0[i];    
           if ((j >= 48) && (j <= 57)) {    
               j = (((j - 48) + 5) % 10) + 48;    
           } else if ((j >= 65) && (j <= 90)) {    
               j = (((j - 65) + 13) % 26) + 65;    
           } else if ((j >= 97) && (j <= 122)) {    
               j = (((j - 97) + 13) % 26) + 97;    
           }    
           ac[i] = (char) j;    
           i++;    
       }    
       return String.valueOf(ac);    
   }    
  
   public MyEclipseGen() {    
       super();    
   }    
  
   public static void main(String[] args) {    
       try {    
           System.out.println("please input register name:");    
           BufferedReader reader = new BufferedReader(new InputStreamReader(    
                   System.in));    
           String userId = null;    
           userId = reader.readLine();    
           MyEclipseGen myeclipsegen = new MyEclipseGen();    
           String res = myeclipsegen.getSerial(userId, "20");    
           System.out.println("Serial:" + res); //输出序列号信息   
           reader.readLine();    
       } catch (IOException ex) {    
         
       }    
   }    
}