Chapter 7, Problem 9PE

Explanation of Solution

Program:

File name: “PhoneNumberFormat.java”

//Import necessary header files

import java.util.Scanner;

//Define a class named PhoneNumberFormat

public class PhoneNumberFormat

{

    //Define main method

    public static void main(String args[])

    {

        //Create an object for the Scanner class

        Scanner scanner = new Scanner(System.in);

        //do..while loop

        do

        {

            //Prompt the user to enter a Phone Number

            System.out.print("\nEnter the Phone Number: ");

            String textPhone = scanner.nextLine();

 /*Continue to accept the user input until the user enters 999*/

            if (textPhone.contains("999"))

                break;

            //If the user enters a ten-digit phone number

            if (textPhone.matches("[0-9]+") && textPhone.length() == 10)

            {

                //Print the result

                System...