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  1. class Caesar {   
  2.     public static final int ALPHASIZE = 26;    
  3.     public static final char[] alpha = {'A', 'B', 'C',  
  4.          'D','E', 'F','G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 
  5.          'R','S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};    
  6.     protected char[] encrypt = new char[ALPHASIZE];
  7.     protected char[] decrypt =  new char[ALPHASIZE];    
  8.  
  9.     public Caesar(){        
  10.  
  11.     	for(int i = 0; i < ALPHASIZE; i++)        
  12.  
  13.         	encrypt[i] = alpha[(i + 3) % ALPHASIZE];             
  14.  
  15.     	for (int i = 0; i < ALPHASIZE; i++)
  16.  
  17.         	decrypt[encrypt[i] - 'A'] = alpha[i];    
  18. }
  19.  
  20. // Encryption Methord    
  21.     public String encrypt(String secret){
  22.  
  23.         char[] mess = secret.toCharArray();
  24.  
  25.         for (int i = 0; i < mess.length; i++)
  26.  
  27.             if (Character.isUpperCase(mess[i]))
  28.  
  29.                 mess[i] = encrypt[mess[i] - 'A'];
  30.  
  31.         return new String(mess);
  32.     }
  33.  
  34. // Decryption Methord    
  35.     public String decrypt(String secret){
  36.  
  37.         char[] mess = secret.toCharArray();
  38.  
  39.         for (int i = 0; i < mess.length; i++)
  40.  
  41.             if (Character.isUpperCase(mess[i]))
  42.  
  43.                 mess[i] = decrypt[mess[i] - 'A'];
  44.  
  45.         return new String(mess);
  46.  
  47.     }
  48.  
  49. // Main Methord        
  50.     public static void main(String[] args) {
  51.  
  52.         Caesar cipher = new Caesar();
  53.  
  54.         System.out.println("Encryption order = " + new String(cipher.encrypt) );
  55.  
  56.         System.out.println("Decryption order = " + new String(cipher.decrypt) );
  57.  
  58.         String secret = "THE ENGLE IS IN PLA; MEET AT JOE'S";
  59.  
  60.         secret = cipher.encrypt(secret);
  61.  
  62.         System.out.println(secret);
  63.  
  64.         secret = cipher.decrypt(secret);
  65.  
  66.         System.out.println(secret);        
  67.     }    
  68. }
  69.  
  70.  
Success #stdin #stdout 0.09s 212416KB
comments (?)
stdin 
1
2
10
42
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stdout 
Encryption order = DEFGHIJKLMNOPQRSTUVWXYZABC
Decryption order = XYZABCDEFGHIJKLMNOPQRSTUVW
WKH HQJOH LV LQ SOD; PHHW DW MRH'V
THE ENGLE IS IN PLA; MEET AT JOE'S
https://ideone.com/7SWO4
language:
Java (HotSpot 12)
created:
14 years ago
visibility:
public

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