Logical error 2nd Edition... :~(

Question

here is the 2nd edition of the program.
it runs wired, i can't exactly tell how, but the way it does just like lost-control.
copy it and give it a try see if you have any idea what's going on.
p.s. all called methods are sticked after the main program.
class DecodeDriver
     public static void main(String[] args)
          char keyin;
          do
               sop("**********************************************");
               sop("**********************************************");
               sop("**            M A I N   M E N U             **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** M) Morse Code                            **");
               sop("** C) Caesar Cipher                         **");
               sop("** V) Vignere Cipher                        **");
               sop("** P) Playfair Cipher                       **");
               sop("** ---------------------------------------- **");
               sop("** X) Exit Program                          **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select an encoding scheme: ");
               keyin = SavitchIn.readNonwhiteChar();
               switch(keyin)
               case'M':
               case'm': Morse();
                    break;
                    case'C':
               case'c': Caesar();
                    break;
                    case'V':
               case'v': Vignere();
                    break;
                    case'P':
               case'p': Playfair();
                    break;
                    case'X':
                    case'x': sop("Thanks for using! Bye!");
                    break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
                    break;
               } //switch
          } // do
          while(keyin != 'X' && keyin != 'x');
          System.exit(0);
     } // main
          public static void Morse()
               char subKeyin;
               sop("**********************************************");
               sop("**********************************************");
               sop("**            Morse Code Menu               **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               subKeyin = SavitchIn.readNonwhiteChar();
               switch(subKeyin)
                    case'E':
                    case'e': MorseCode.encode();
                    break;
                    case'D':
                    case'd': MorseCode.decode();
                    break;
                    case'X':
                    case'x': sop("Returning to main menu...");
                               break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
                                   break;
               } // switch
          } //Morse
          private static void Caesar()
               char subKeyin = SavitchIn.readNonwhiteChar();
               sop("**********************************************");
               sop("**********************************************");
               sop("**           Caesar Cipher Menu             **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               switch(subKeyin)
                    case'E':
                    case'e': CaesarCipher.encode();
                    case'D':
                    case'd': CaesarCipher.decode();
                    case'X':
                    case'x': sop("Returning to main menu...");
                               break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
               } // switch
          } //CaesarCipher
          private static void Vignere()
               char subKeyin = SavitchIn.readNonwhiteChar();
               sop("**********************************************");
               sop("**********************************************");
               sop("**           Vignere Cipher Menu             **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               switch(subKeyin)
                    case'E':
                    case'e': VignereCipher.encode();
                    case'D':
                    case'd': VignereCipher.decode();
                    case'X':
                    case'x': sop("Returning to main menu...");
                               break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
               } // switch
          } //VignereCipher          
          private static void Playfair()
               char subKeyin = SavitchIn.readNonwhiteChar();
               sop("**********************************************");
               sop("**********************************************");
               sop("**          Playfair Cipher Menu            **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               switch(subKeyin)
                    case'E':
                    case'e': PlayfairCipher.encode();
                    case'D':
                    case'd': PlayfairCipher.decode();
                    case'X':
                    case'x': sop("Returning to main menu...");
                               break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
               } // switch
          } //PlayfairCipher     
          private static void sop(String newString)
               System.out.println(newString);
          } // sop
} //class
(part of)the SavitchIn input stuff:
    public static char readNonwhiteChar( )
      char next;
      next = readChar( );
      while (Character.isWhitespace(next))
          next = readChar( );
      return next;
     The following methods are not used in the text, except
     for a brief reference in Chapter 2. No program code uses
     them. However, some programmers may want to use them.
     Precondition: The next input in the stream consists of
     an int value, possibly preceded by whitespace, but
     definitely followed by whitespace.
     Action: Reads the first string of nonwhitespace characters
     and returns the int value it represents. Discards the
     first whitespace character after the word. The next read
     takes place immediately after the discarded whitespace.
     In particular, if the word is at the end of a line, the
     next read will take place starting on the next line.
     If the next word does not represent an int value,
     a NumberFormatException is thrown.
MorseCode.java - for debugin' propose.
class MorseCode
   public MorseCode()
      sop("unfinished - const.");
     }//const.
     public static void encode()
          sop("unfinished - encode");
          char newchar;
          newchar = SavitchIn.readChar();
          System.out.println(newchar);
     public static void decode()
          sop("unfinished - decode");
     private static void sop(String newString)
          System.out.println(newString);
     } // sop
}//class

Answer 1

aside from the missing breaks?
encode OR decode
case'E':
case'e': CaesarCipher.encode();
break;
case'D':
case'd': CaesarCipher.decode();
break;looks better this time?
class DecodeDriver
     public static void main(String[] args)
          char keyin;
          do
               sop("**********************************************");
               sop("**********************************************");
               sop("**            M A I N   M E N U             **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** M) Morse Code                            **");
               sop("** C) Caesar Cipher                         **");
               sop("** V) Vignere Cipher                        **");
               sop("** P) Playfair Cipher                       **");
               sop("** ---------------------------------------- **");
               sop("** X) Exit Program                          **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select an encoding scheme: ");
               keyin = SavitchIn.readNonwhiteChar();
               switch(keyin)
               case'M':
               case'm': Morse();
                    break;
               case'C':
               case'c': Caesar();
                    break;
               case'V':
               case'v': Vignere();
                    break;
               case'P':
               case'p': Playfair();
                    break;
               case'X':
               case'x': sop("Thanks for using! Bye!");
                    break;
               default: sop("Invalid Key Entered. Please select one from the menu.");
                    break;
               } //switch
          } // do
          while(keyin != 'X' && keyin != 'x');
          System.exit(0);
     } // main
          public static void Morse()
               char subKeyin;
               sop("**********************************************");
               sop("**********************************************");
               sop("**            Morse Code Menu               **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               subKeyin = SavitchIn.readNonwhiteChar();
               switch(subKeyin)
                    case'E':
                    case'e': MorseCode.encode();
                    break;
                    case'D':
                    case'd': MorseCode.decode();
                    break;
                    case'X':
                    case'x': sop("Returning to main menu...");
                    break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
                    break;
               } // switch
          } //Morse
          private static void Caesar()
               char subKeyin;
               sop("**********************************************");
               sop("**********************************************");
               sop("**           Caesar Cipher Menu             **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               subKeyin =  SavitchIn.readNonwhiteChar();
               switch(subKeyin)
                    case'E':
                    case'e': CaesarCipher.encode();
                    break;
                    case'D':
                    case'd': CaesarCipher.decode();
                    break;
                    case'X':
                    case'x': sop("Returning to main menu...");
                               break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
                                   break;
               } // switch
          } //CaesarCipher
          private static void Vignere()
               char subKeyin;
               sop("**********************************************");
               sop("**********************************************");
               sop("**           Vignere Cipher Menu             **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               subKeyin  = SavitchIn.readNonwhiteChar();
               switch(subKeyin)
                    case'E':
                    case'e': VignereCipher.encode();
                    break;
                    case'D':
                    case'd': VignereCipher.decode();
                    break;
                    case'X':
                    case'x': sop("Returning to main menu...");
                    break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
                    break;
               } // switch
          } //VignereCipher          
          private static void Playfair()
               char subKeyin;
               sop("**********************************************");
               sop("**********************************************");
               sop("**          Playfair Cipher Menu            **");
               sop("**        ~~~~~~~~~~~~~~~~~~~~~~~~          **");
               sop("** ======================================== **");
               sop("** E) Encode                                **");
               sop("** D) Decode                                **");
               sop("** ---------------------------------------- **");
               sop("** X) Return to Main Program                **");
               sop("**                                          **");
               sop("**********************************************");
               sop("**********************************************");
               sop(" ");
               sop("Please select to encoding / decoding: ");
               subKeyin  = SavitchIn.readNonwhiteChar();
               switch(subKeyin)
                    case'E':
                    case'e': PlayfairCipher.encode();
                    break;
                    case'D':
                    case'd': PlayfairCipher.decode();
                    break;
                    case'X':
                    case'x': sop("Returning to main menu...");
                    break;
                    default: sop("Invalid Key Entered. Please select one from the menu.");
                    break;
               } // switch
          } //PlayfairCipher     
          private static void sop(String newString)
               System.out.println(newString);
          } // sop
} //class