Login system spørgsmål kode

Java kode 

 /*GUI*/
 
 private void jb_LoginActionPerformed(java.awt.event.ActionEvent evt) {                                                 
         String username_var = jtf_Username.getText();
         char password_array[] = jpf_Password.getPassword();
         
         /**
          * Create a empty string to compile the password from the
          * char array into
          */
         String compile_password = "";
         
         /**
          * Compile the password
          */
         StringBuilder sb = new StringBuilder();
         for(char b : password_array)
         {
             sb.append(b);
         }
         
         /**
          * Call the Password_diagest class to digest the password to hex
          */
         Password_diagest pd = new Password_diagest();
         
         /**
          * Get the returned hex hash
          */
         String password_hash = pd.digest_password(sb.toString());
         
         Dal1 d = new Dal1();
         try 
         {
             /**
              * Create a sql connection
              */
             d.sqlConnection();
             
             /**
              * Check if input password hash and db password hash match.
              */
             boolean doesPasswordMatch = d.checkPassword(username_var, password_hash);
             if(doesPasswordMatch == true)
             {
                 //JOptionPane.showMessageDialog(null, "Login accepted");
                 GUI3 g3 = new GUI3();
                 g3.show();
                 
                 this.hide();
             }
             else
             {
                 JOptionPane.showMessageDialog(null, "Try again");
             }
         }
         catch(Exception e)
         {
             JOptionPane.showMessageDialog(null, e.fillInStackTrace());
         }
         
     }

Java kode 

 public boolean checkPassword(String username, String input_password) throws SQLException
     {
         ResultSet rs = null;
         
         CallableStatement proc = conn.prepareCall("{ call SP_GET_PASSWORD_HASH(?) }");
         proc.setString(1, username);
         rs = proc.executeQuery();
         
         String password_hash = "";
         while(rs.next())
         {
            password_hash = rs.getString(1);
         }
         
         if(input_password.equals(password_hash))
         {
             return true;
         }
         
         return false;
     }

Java kode 

 public class Password_diagest 
 {
     public String digest_password(String password)
     {
         byte[] thedigest = new byte[0];
         
         try 
         {
             byte[] bytesOfMessage = password.getBytes("UTF-8");
             MessageDigest password_md5 = MessageDigest.getInstance("MD5");
             thedigest = password_md5.digest(bytesOfMessage);
         } 
         
         catch (NoSuchAlgorithmException ex) 
         {
             Logger.getLogger(GUI2.class.getName()).log(Level.SEVERE, null, ex);
         } 
         catch (UnsupportedEncodingException ex) 
         {
             Logger.getLogger(GUI2.class.getName()).log(Level.SEVERE, null, ex);
         }
         
         /**
          * Compile hash into hex code
          */
         StringBuilder sb = new StringBuilder();
         for(byte b : thedigest)
         {
             sb.append(Integer.toHexString((int) (b & 0xff)));
         }
         
         String password_md5 = sb.toString();
         
         return password_md5;
     }
 }

her tænker jeg information som "brugernavn" og "adgangskode"