破解MyEcilpse5.5GA版本的注册码 很好用（仅供学习参考）

package t4_12;

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

public class test {

private static final String L = "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 static void main(String args[]) {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
String userId = null;
int intLicenseNum = 1;
String strLicenseNum = null;
boolean bProFlag = true;
String strProFlag = null;
while (userId == null || "".equals(userId.trim())) {
System.out.print("Subscriber: ");
try {
userId = br.readLine();
} catch (IOException ioexception) {
}
}
System.out.print("Number of licenses(default 1, max 999): ");
try {
strLicenseNum = br.readLine();
} catch (IOException ioexception1) {
}
NumberFormat nf = new DecimalFormat("000");
if (strLicenseNum == null || "".equals(strLicenseNum.trim())) {
strLicenseNum = nf.format(intLicenseNum);
} else {
strLicenseNum = nf.format(Integer.parseInt(strLicenseNum));
}
System.out.print("Professional or Standard(default pro, n=stand): ");
try {
strProFlag = br.readLine();
} catch (IOException ioexception2) {
}
if (strProFlag != null && !"".equals(strProFlag.trim())) {
bProFlag = false;
}
Calendar cal = Calendar.getInstance();
cal.add(1, 2);
cal.add(6, -1);
SimpleDateFormat sdf = new SimpleDateFormat("yyMMdd");
String need = userId.substring(0, 1) + "Y"
+ (bProFlag ? "E3MP" : "E2MY") + "-100" + strLicenseNum + "-"
+ sdf.format(cal.getTime()) + "0";
String dx = need
+ "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."
+ userId;
int suf = decode(dx);
String code = need + suf;
System.out.println("Subscription Code: " + change(code));
}

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);
}
}