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  1. package com.sanfoundry.setandstring;
  2.  
  3.  
  4. import java.util.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8.  
  9. public class VigenereCipher
  10. {
  11.     public static String encrypt(String text, final String key)
  12.     {
  13.         String res = "";
  14.         text = text.toUpperCase();
  15.         for (int i = 0, j = 0; i < text.length(); i++)
  16.         {
  17.             char c = text.charAt(i);
  18.             if (c < 'A' || c > 'Z')
  19.                 continue;
  20.             res += (char) ((c + key.charAt(j) - 2 * 'A') % 26 + 'A');
  21.             j = ++j % key.length();
  22.         }
  23.         return res;
  24.     }
  25.  
  26.     public static String decrypt(String text, final String key)
  27.     {
  28.         String res = "";
  29.         text = text.toUpperCase();
  30.         for (int i = 0, j = 0; i < text.length(); i++)
  31.         {
  32.             char c = text.charAt(i);
  33.             if (c < 'A' || c > 'Z')
  34.                 continue;
  35.             res += (char) ((c - key.charAt(j) + 26) % 26 + 'A');
  36.             j = ++j % key.length();
  37.         }
  38.         return res;
  39.     }
  40.  
  41.     public static void main(String[] args)
  42.     {
  43.         String key = "VIGENERECIPHER";
  44.         String message = "Beware the Jabberwock, my son! The jaws that bite, the claws that catch!";
  45.         String encryptedMsg = encrypt(message, key);
  46.         System.out.println("String: " + message);
  47.         System.out.println("Encrypted message: " + encryptedMsg);
  48.         System.out.println("Decrypted message: " + decrypt(encryptedMsg, key));
  49.     }
  50. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:9: error: class VigenereCipher is public, should be declared in a file named VigenereCipher.java
public class VigenereCipher
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/4CHpSD
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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