打开MyEclipse新建一个Javaproject，然后新建类，粘贴例如以下代码，就可以生成MyEclipse的注冊码

import java.io.BufferedReader;   
import java.io.IOException;   
import java.io.InputStreamReader;   
 
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.";   
 
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, "5");   
    System.out.println("Serial:" + res);   
    reader.readLine();   
  } catch (IOException ex) {   
  }   
}   
}