Make the program run again, given the user's input?

Hello,
I need a little help with this program, you can see the entire thing below. I'm trying to make the program give the user the option to run again, using y or n. It's for a college project. Thanks.
import java.util.*;
class MyFifthProgram
     public static void main (String[] args)
          //char letterOnTelephone;
          do
               System.out.print("Enter a letter from A - Z and I will output the corresponding number \non the telephone, then press enter:");
               Scanner keyboard = new Scanner(System.in);
               String letterOnTelephone = keyboard.next();
               char letter = letterOnTelephone.charAt(0);
               switch (letter)
                    case 'Q':
                    case 'q':
                    case 'Z':
                    case 'z':
                         System.out.println("Sorry, the letter " + letterOnTelephone + " cannot be found on the telephone....");
                         break;
                    default:
                         System.out.println("Sorry, the key " + letterOnTelephone + " cannot be found on the telephone......");
                         break;
                    case 'A':
                    case 'a':
                    case 'B':
                    case 'b':
                    case 'C':
                    case 'c':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 2.");
                         break;
                    case 'D':
                    case 'd':
                    case 'E':
                    case 'e':
                    case 'F':
                    case 'f':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 3.");
                         break;
                    case 'G':
                    case 'g':
                    case 'H':
                    case 'h':
                    case 'I':
                    case 'i':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 4.");
                         break;
                    case 'J':
                    case 'j':
                    case 'K':
                    case 'k':
                    case 'L':
                    case 'l':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 5.");
                         break;
                    case 'M':
                    case 'm':
                    case 'N':
                    case 'n':
                    case 'O':
                    case 'o':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 6.");
                         break;
                    case 'P':
                    case 'p':
                    case 'R':
                    case 'r':
                    case 'S':
                    case 's':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 7.");
                         break;
                    case 'T':
                    case 't':
                    case 'U':
                    case 'u':
                    case 'V':
                    case 'v':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 8.");
                         break;
                    case 'W':
                    case 'w':
                    case 'X':
                    case 'x':
                    case 'Y':
                    case 'y':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 9.");
                         break;
               System.out.println("Would you like to run this program again? Enter Y for yes, or N for no:");
               Scanner keyboard1 = new Scanner(System.in);
               String runAgain = keyboard1.next();
               char runIt = runAgain.charAt(0);
               }while (runIt == 'y');
                    System.out.println("You can choosen " + runAgain + " therefor the program will run again.");
     }

Thanks! That did the trick, however that doesn't solve my problem. How do I ask the user to run the program again at the end of the program? What am I missing?
// Program takes a single letter and displays the corresponding digit on the telephone.
import java.util.*;
class MyFifthProgram
     public static void main (String[] args)
          System.out.println("Would you like to run this program? Enter Y for yes, or N for no:");
          Scanner keyboard1 = new Scanner(System.in);
          String runAgain = keyboard1.next();
          char runIt = runAgain.charAt(0);
          if (runIt == 'n')
               System.exit(0);
          else if (runIt == 'N')
               System.exit(0);
          do
               System.out.print("Enter a letter from A - Z and I will output the corresponding number \non the telephone, then press enter:");
               Scanner keyboard = new Scanner(System.in);
               String letterOnTelephone = keyboard.next();
               char letter = letterOnTelephone.charAt(0);
               switch (letter)
                    case 'Q':
                    case 'q':
                    case 'Z':
                    case 'z':
                         System.out.println("Sorry, the letter " + letterOnTelephone + " cannot be found on the telephone....");
                         break;
                    default:
                         System.out.println("Sorry, the key " + letterOnTelephone + " cannot be found on the telephone......");
                         break;
                    case 'A':
                    case 'a':
                    case 'B':
                    case 'b':
                    case 'C':
                    case 'c':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 2.");
                         break;
                    case 'D':
                    case 'd':
                    case 'E':
                    case 'e':
                    case 'F':
                    case 'f':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 3.");
                         break;
                    case 'G':
                    case 'g':
                    case 'H':
                    case 'h':
                    case 'I':
                    case 'i':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 4.");
                         break;
                    case 'J':
                    case 'j':
                    case 'K':
                    case 'k':
                    case 'L':
                    case 'l':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 5.");
                         break;
                    case 'M':
                    case 'm':
                    case 'N':
                    case 'n':
                    case 'O':
                    case 'o':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 6.");
                         break;
                    case 'P':
                    case 'p':
                    case 'R':
                    case 'r':
                    case 'S':
                    case 's':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 7.");
                         break;
                    case 'T':
                    case 't':
                    case 'U':
                    case 'u':
                    case 'V':
                    case 'v':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 8.");
                         break;
                    case 'W':
                    case 'w':
                    case 'X':
                    case 'x':
                    case 'Y':
                    case 'y':
                         System.out.println("The letter " + letterOnTelephone + " corresponds to the number 9.");
                         break;
               }while (runIt == 'n');
          //          System.out.println("Would you like to run this program? Enter Y for yes, or N for no:");
          //          Scanner keyboard2 = new Scanner(System.in);
          //          String runAgain1 = keyboard2.next();
          //          char runIt1 = runAgain1.charAt(0);
          //          if (runIt1 == 'n')
          //               System.exit(0);
          //          else if (runIt1 == 'N');
          //               System.exit(0);
     }

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