main.java

java的学习过程中用过的源码

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) {
      //"next_dream"为用户名。
      String userId = "next_dream";
      //MyEclipse4.1 GA 其中491（4.9.1）/400（4.0）/401（4.1）/501（5.1.0）/511(5.1.1)，（）内为版本号，9912310代表注册码过期时间2099/12/31
      //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-511-00-9912310";
      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;
          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);
  }
}