Write a test program that prompts the user to enter a phone number as a string.

Question

Write a test program that prompts the user to enter a phone number as a string. The input number may contain letters. The program translates a letter (uppercase or lowercase) to a digit and leaves all other characters intact. Here is a sample run of the program:

Enter a string: 1-800-Flowers

1-800-3569377
Enter a string: 1800flowers

18003569377

This is what I have

import java.util.*;
import java.lang.String;
import java.lang.Character;

public class CheckPassword
{
public static void main (String[] args)
{
Scanner input = new Scanner(System.in);
System.out.println("Enter a phone number");
String a = input.nextLine();
char ch;
for (int x = 0; x<a.length();x++)
{
ch = a.charAt(x);
if (Character.isUpperCase(ch))
ch = getNumber(ch);
  
}
System.out.println(a);
}

public static char getNumber(char uppercaseLetter)
{
char getNumber = '0';
switch (uppercaseLetter)
{
case 'A':
case 'B':
case 'C':
getNumber = '2';
break;
  
case 'D':
case 'E':
case 'F':
getNumber = '3';
break;
  
case 'G':
case 'H':
case 'I':
getNumber = '4';
break;
  
case 'J':
case 'K':
case 'L':
getNumber = '5';
break;
  
case 'M':
case 'N':
case 'O':
getNumber = '6';
break;
  
case 'P':
case 'Q':
case 'R':
case 'S':
getNumber = '7';
break;
  
case 'T':
case 'U':
case 'V':
getNumber = '8';
break;
  
case 'W':
case 'X':
case 'Y':
case 'Z':
getNumber = '9';
break;
}
return getNumber;
}
}

Explanation / Answer

/**The java program CheckPassword that prompts user
* to enter a string contains digits and alphabets
* Then the program converts the alphabets to
* corresponding digits and print to console*/
//CheckPassword.java
import java.util.*;
import java.lang.String;
import java.lang.Character;
public class CheckPassword
{
   public static void main (String[] args)
   {
       //Declare a string object ,digitString
       String digitString="";
       char ch;
       //Create an instance of Scanner class
       Scanner input = new Scanner(System.in);
       System.out.println("Enter a phone number");
       //read input into a
       String a = input.nextLine();
      
       for (int x = 0; x<a.length();x++)
       {
           ch = a.charAt(x);
           //Check if the character,ch is not digit
           if (!Character.isDigit(ch))
           {
               //Then convert the character, ch to upper case
               ch=Character.toUpperCase(ch);
               //Call getNumber method to convert the alphabet
               //to the corresponding digit
               ch = getNumber(ch);
               //concateneate the character,ch with digitString
               digitString+=ch;
           }
           else
               //otherwise append ch to the digitString
               digitString+=ch;
       }
       //print digitString object
       System.out.println(digitString);
   }

   /*The method getNumbre that takes a character and check for
   * the match case of upper case alphabets and returns the
   * correspondig letter otherwise return the input argument
   * as returns type*/
   public static char getNumber(char uppercaseLetter)
   {
       //Assign the uppercaseLetter to getNumber
       char getNumber = uppercaseLetter;
       switch (uppercaseLetter)
       {
       case 'A':

       case 'B':
       case 'C':
           getNumber = '2';
           break;

       case 'D':
       case 'E':
       case 'F':
           getNumber = '3';
           break;

       case 'G':
       case 'H':
       case 'I':
           getNumber = '4';
           break;

       case 'J':
       case 'K':
       case 'L':
           getNumber = '5';
           break;

       case 'M':
       case 'N':
       case 'O':
           getNumber = '6';
           break;

       case 'P':
       case 'Q':
       case 'R':
       case 'S':
           getNumber = '7';
           break;

       case 'T':
       case 'U':
       case 'V':

           getNumber = '8';
           break;

       case 'W':
       case 'X':
       case 'Y':
       case 'Z':
           getNumber = '9';
           break;
       }
       //return getNumber
       return getNumber;
   }
}

----------------------------------------------------------------------------------------------------------------

Sample output:

Output1:

Enter a phone number
1-8-00-Flowers
1-8-00-3569377

Output2:

Enter a phone number
1800flowers
18003569377

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