Hash Calculator

Look at this code and see if you guys like to make this code into a more complex project. Always talk about a way to test if your code works properly and testing methodology before implementing your code. Testing is as important as coding.

import java.util.Scanner;
import java.security.MessageDigest;
import javax.swing.JOptionPane;
import java.io.UnsupportedEncodingException;

/**
* Application to practice creating a message digest with specifying algorithm
* @author Zoltan
* @version 1.0.0
*
*/
public class Driver {

/**
* Entry point to the application
* @param args String array that is not used in this code
*/
public static void main(String[] args) {

//variable declarations
byte[] messageBytes;
String password;
MessageDigest mDigest;
byte[] theHash;

//Let user specify the clear text password by entering a string
password = JOptionPane.showInputDialog("Please enter your password");
JOptionPane.showMessageDialog(null, "Your password was: "+password);

//Convert the entered password string to a byte array in UTF-8 encoding
//The encoding should never throw an exception in this case, but it is required for this method.
try{
      messageBytes= password.getBytes("UTF-8");
      }
catch (UnsupportedEncodingException e) {
                   throw new AssertionError("UTF-8 is unknown");
      }

//Generate the message digest for the clear text of byte array
try{
      //Lookup the available algorithms and adjust the code to be dynamic of fix
      // http://docs.oracle.com/javase/7/docs/technotes/guides/security/StandardNames.html#MessageDigest
       mDigest = MessageDigest.getInstance("MD5");
       theHash = mDigest.digest(messageBytes);

       //Convert the byte array to Hex values for display 
       StringBuffer sBuffer = new StringBuffer();
      
       for (int i = 0; i < theHash.length; i++) {
             sBuffer.append(Integer.toString((theHash[i] & 0xff) + 0x100, 16).substring(1));
            }

       // Verify the results on-line with a simple string
       // like "password" http://www.miraclesalad.com/webtools/md5.php

       JOptionPane.showMessageDialog(null, "Your password hash is: "+sBuffer);
}
catch (java.security.NoSuchAlgorithmException e) { }

     }// end of main method
}//end of Driver class