Generate myecplies activation code code

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.SimpleDateFormat;
import java.util.Calendar;


public class MyeclipseKeyMaker {


public MyeclipseKeyMaker() {
}


public static void main(String args[]) {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String userId = null;
while (userId == null || "".equals(userId.trim())) {
System.out.print("Subscriber: ");
try {
userId = br.readLine();
} catch (IOException ioexception) {
}
}
Calendar cal = Calendar.getInstance();
cal.add(Calendar.YEAR, 2);
cal.add(Calendar.DAY_OF_YEAR, -1);
SimpleDateFormat sdf = new SimpleDateFormat("yyMMdd");
String seed = "000-" + sdf.format(cal.getTime()) + "0";


// for pro version
String need = userId.substring(0, 1) + "YE3MP-300" + seed;
String dx = need + LICENSE + userId;
int suf = decode(dx);
String code = need + suf;
System.out.println("Subscription Code: \n" + change(code));


// for blue version
need = userId.substring(0, 1) + "YE3MB-300" + seed;
dx = need + LICENSE + userId;
suf = decode(dx);
code = need + suf;
System.out.println("\nBlue Editon Subscription Code: \n"+ change(code));

// for Spring version
need = userId.substring(0, 1) + "YE3MS-300" + seed;
dx = need + LICENSE + userId;
suf = decode(dx);
code = need + suf;
System.out.println("\nSpring Editon Subscription Code: \n" + change(code));
}


private final static String LICENSE = "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.";


static int decode(String s) {
int i = 0;
char ac[] = s.toCharArray();
int j = 0;
for (int k = ac.length; j < k; j++)
i = 31 * i + ac[j];
return Math.abs(i);
}


static String change(String s) {
if (s == null || s.length() == 0)
return s;
byte abyte0[] = s.getBytes();
char ac[] = new char[s.length()];
int i = 0;
for (int k = abyte0.length; i < k; i++) {
int 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;
}
return String.valueOf(ac);
}
}