import java.io.*;
/**
* MyEclipse6.0 Register Code
* @author 匿名
*
*/
public class KeyGenerator {
    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 KeyGenerator() {
        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();
            KeyGenerator myeclipsegen = new KeyGenerator();
            String res = myeclipsegen.getSerial(userId, "20");
            System.out.println("Serial:" + res);
            reader.readLine();
        } catch (IOException ex) {
        }
    }
}
以下是7.0的算法，

 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 /**
* MyEclipse7.0 Register Code
* @author 匿名
*
*/
 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) {
    }
 }
}