ReadChars.java

import java.io.*;
import java.util.*;
import java.util.regex.Pattern;

public class ReadChars {
   final static Scanner STDIN = new Scanner (System.in).useDelimiter ("");

   private static final Pattern DOT = Pattern.compile(".", Pattern.DOTALL);

   // Get the next character from the stream, or raise null pointer exception
   public static char nextChar (Scanner s) {
      return s.findWithinHorizon(DOT,1).charAt(0);
   }

   public static void main (String[] args) throws IOException {
      for (;;) {
         System.out.printf ("%x%n", (int) nextChar(STDIN));
      }
   }

}