Myeclipse 5.1 注册码算法

import java.io.*; public class Main {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) {String userId = "xiangfei";//MyEclipse4.1 GA 其中491(4.9.1)/400(4.0)/401(4.1)/501(5.1.0)，()内为版本号，9912310代表注册码过期时间2099/12/31String need = userId.substring(0,1) + "YE3MP-401-00-9912310";//MyEclipse4.0.0 GA//String need = userId.substring(0,1) + "YE3MP-400-01-9912310";//MyEclipse4.9.1//String need = userId.substring(0,1) + "YE3MP-491-01-9912310";//MyEclipse5.1.0 GA//String need = userId.substring(0,1) + "YE3MP-501-00-9912310";String dx = need + L + userId;int suf = decode(dx);//System.out.println("SUF:"+suf);String code = need + suf;System.out.println(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) {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;elseif(j >= 65 && j <= 90)j = ((j - 65) + 13) % 26 + 65;elseif(j >= 97 && j <= 122)j = ((j - 97) + 13) % 26 + 97;ac[i] = (char)j;}return String.valueOf(ac);}}