import java.util.*;
import javax.swing.*;
public class HammingClient
{
   private static boolean evenParity;

   //The Input Message
   private static String text_IN;
   
   //The Decoded Message
   private static String text_OUT;
   
   //The Hamming Code-Words
   private static ArrayList<int[]> buffer;
   
   
   public static void main(String[] args)
   {
      evenParity = (new Random()).nextBoolean();
      
      enterText();   //Enter a text message
      encodeText();  //Create its Hamming-encoding
      sendText();    //Create some single-bit errors
      decodeText();  //Interpret the Hamming code
      
      //Display the entered and received texts
      System.out.println(text_IN + "\n" + text_OUT);
   }
   
   //Interactively input a text-message to be encoded & sent
   // The message is recorded in :text_IN:
   private static void enterText()
   {
   }
   
   //Create a Hamming encoding of the message in :text_IN:
   // The Hamming Code-Words are recorded in :buffer:
   private static void encodeText()
   {
   }
   
   //Simulate sending the coded message from the :buffer:
   // Introduce random single-bit errors in randomly selected codes
   private static void sendText()
   {
      for (int i = 0; i < buffer.size(); i++)
      {
         int[] bits = buffer.get(i);

         int index = (new Random()).nextInt(bits.length * 2);
         if ( index < bits.length )
         {
            bits[index] = 1 - bits[index];
            buffer.set(i, bits);
         }
      }
   }
   
   //Interpret the Hamming-encoded text stored in :buffer:
   // Detect & Correct any single-bit errors in each code
   // Store the interpreted message in :text_OUT:
   private static void decodeText()
   {
   }
}