Java problem: A common programming activity involves the extraction and processi

Question

Java problem:
A common programming activity involves the extraction and processing of data contained in a string, such as separating a sentence into individual words. We typically refer to these separate words as tokens.

The purpose of this exercise is to develop a program that tokenizes an input string.

Can somone write a program that inputs a telephone number as a string in the form (555) 555-5555. The program should use String method split to extract the area code as a token, the first three digits of the phone number as a token and the last four digits number as a token. The seven digits of the phone number should be concatenated into one string. Both the area code and the phone number should be printed.

Once you have a working version of the program, extend it to process an input string that contains multiple, comma separated, phone numbers, such as
(555) 555-5555, (444) 444-4444, (333) 333-3333). For the purpose of this exercise assume that the input string contains well-formed telephone numbers.

Note: it is Java program

Thanks in advance

Explanation / Answer

/**
* The java program that prompts to enter comma,separated
* string phone numbers and divides the phone numbers into
* area code and telephone numbers using split and StringTokenizer
* class
* */
//TelephoneProgram.java
import java.util.Scanner;
import java.util.StringTokenizer;
public class TelephoneProgram
{
   public static void main(String[] args)
   {
       //Scanner class object to read input from keyboard
       Scanner input=new Scanner(System.in);
       //To read input phone numbers
       String inputLine;
      
       System.out.println("Enter comma separated ,multiple telephone numbers");
       System.out.println("(xxx)xxx-xxxx,(xxx)xxx-xxxx,");
       //prompt for user input
       inputLine=input.nextLine();
      
       //Using split method
       /* Call the method split that splits the inputLine string into
       an array of string phone numbers*/
       String[] phoneNumbers=inputLine.split(",");
      
      
       //Iterate over the string of phone numbers
       for (String phoneNumber : phoneNumbers)
       {      
           //Using StringTokenizer class
           /*create an instance of StringTokenizer class that
           takes the phoneNumber string and seprates the phone numbers using
           - hyphen */
           StringTokenizer tokens=
                   new StringTokenizer(phoneNumber, "-");
                  
           /*Extract the first token using nextToken method and
           call the method substring that gets the string from index 1 to substring
           of index 4 */
           System.out.println("Tele-phone Number : "+phoneNumber);
           System.out.println("Area Code : "+tokens.nextToken().substring(1, 4));
           //print next phone number string
           System.out.println("Phone Number : "+tokens.nextToken());
          
       }//end of foreach loop
              
   }//end of main method
  
}//end of the class TelephoneProgram

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

Sample output:
  
   Enter comma separated ,multiple telephone numbers
   (xxx)xxx-xxxx,(xxx)xxx-xxxx,
   (555)555-5555,(444)444-4444,(333)333-3333
   Tele-phone Number : (555)555-5555
   Area Code : 555
   Phone Number : 5555
   Tele-phone Number : (444)444-4444
   Area Code : 444
   Phone Number : 4444
   Tele-phone Number : (333)333-3333
   Area Code : 333
   Phone Number : 3333

Hope this helps you

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