从char打印特殊字符

Question

我正在编写程序将电话号码中的字母转换为相应的数字，除了某些格式外，它几乎完成了：

import java.util.Scanner;
public class PhoneKeypad
{
   public static void main (String [] args)
   { 

Scanner scan = new Scanner (System.in);

String number;

      int currentChar;

      char character;

      int finalNumber;

      int getNumber;

      int start;

      String end;

currentChar = 0;

do
      {
         System.out.print ("\nEnter a phone number with letters: ");
         number = scan.nextLine();

         number = number.toUpperCase();

         while (currentChar < number.length())
         {
            character = number.charAt(currentChar);

            finalNumber = getNumber(character);

            System.out.print (finalNumber);

            currentChar++;
         }

         System.out.print ("\n\nContinue? <y/n> ");
         end = scan.next();

         System.out.flush();

         scan.nextLine(); 

         currentChar = 0;

      } while (!end.equalsIgnoreCase("n"));

   }

public static int getNumber (char uppercaseLetter)
   {
      int resultChar = 0;

      if (Character.isLetter(uppercaseLetter))
      {
         if (uppercaseLetter == 'A' || uppercaseLetter == 'B' || uppercaseLetter == 'C')
            resultChar = 2;

         else if (uppercaseLetter == 'D' || uppercaseLetter == 'E' || uppercaseLetter == 'F')
            resultChar = 3;

         else if (uppercaseLetter == 'G' || uppercaseLetter == 'H' || uppercaseLetter == 'I')
            resultChar = 4;

         else if (uppercaseLetter == 'J' || uppercaseLetter == 'K' || uppercaseLetter == 'L')
            resultChar = 5;

         else if (uppercaseLetter == 'M' || uppercaseLetter == 'N' || uppercaseLetter == 'O')
            resultChar = 6;

         else if (uppercaseLetter == 'P' || uppercaseLetter == 'Q' || uppercaseLetter == 'R' || uppercaseLetter == 'S')
            resultChar = 7;

         else if (uppercaseLetter == 'T' || uppercaseLetter == 'U' || uppercaseLetter == 'V')
            resultChar = 8;

         else if (uppercaseLetter == 'W' || uppercaseLetter == 'X' ||    uppercaseLetter == 'Y' || uppercaseLetter == 'Z')
            resultChar = 9;
      }   

      else if (Character.isDigit(uppercaseLetter))
      {
         resultChar = Character.getNumericValue(uppercaseLetter);
      }     

      return resultChar;        
   }
}

我遇到的问题是，除了字母之外，我需要完全按用户输入的方式打印出电话号码。如果用户输入1-800-flowers，则程序需要将其打印为1-800-3569377。任何特殊字符都是相同的 - 连字符，空格，括号等。 而且解决方案越简单越好，因为我还没有得到数组或任何比方法更复杂的东西。