CONTROL STRUCTURES II: REPETITION - Java Programming: From Problem Analysis to Program Design - page 261

case 'M':
case 'N':
case 'O':
outputMessage = outputMessage
+ "6"; //Line 20

break ; //Line 21

case 'P':
case 'Q':
case 'R':
case 'S':
outputMessage = outputMessage
+ "7"; //Line 22

break ; //Line 23

5

case 'T':
case 'U':
case 'V':
outputMessage = outputMessage
+ "8"; //Line 24

break ; //Line 25

case 'W':
case 'X':
case 'Y':
case 'Z':
outputMessage = outputMessage
+ "9"; //Line 26

}

}
else

//Line 27

outputMessage = outputMessage
+ "Invalid input"; //Line 28

JOptionPane.showMessageDialog( null , outputMessage,
"Telephone Digit",
JOptionPane.PLAIN_MESSAGE); //Line 29

inputMessage = "Enter another uppercase letter "
+ "to find its corresponding "
+ "telephone digit.\n"
+ "To stop the program enter #.\n"
+ "Enter a letter:"; //Line 30

inputString =
JOptionPane.showInputDialog(inputMessage); //Line 31
letter = inputString.charAt(0); //Line 32

} //end while

System.exit(0); //Line 33

}

}