myeclipse序列号注册码生成Java代码 MyEclipseGen

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) {                    }       }   }