JAVA FOR FUN

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) {
????????? //"csdn"為用戶名。
????????? String userId = "csdn";
?????????
????????? //其中491（4.9.1）/400（4.0）/401（4.1）/501（5.1.0），（）內為版本號
????????? //9912310代表注冊碼過期時間2099/12/31
?????????
????????? //MyEclipse4.1 GA
????????? //String 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;
??????????????? 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 = (char)j;
????????? }

????????? return String.valueOf(ac);
??? }
}