Question

Java Your boss has just put you in charge of updating the company's client contact list.

This file contains records in the following format: id,first_name,last_name,email

1,Norry,Killby,nkillby0@photobucket.com

Your job is to reformat each record as follows:

last_name, first_name, email

Killby, Norry, <nkillby0@photobucket.com>

Starter Code:

package contactlistupdater;

import java.io.FileNotFoundException;

import java.io.IOException; import java.nio.file.Paths; import java.util.Formatter; import java.util.Scanner; import sun.reflect.generics.reflectiveObjects.NotImplementedException; public class ContactListUpdater { private static final String INPUT_FILENAME = "contacts.txt"; private static final String OUTPUT_FILENAME = "updated-contacts.txt"; /** * Transforms a String containing a contact entry to a new format */ public static String processContactEntry(String input) { // TODO your code here... return input; } public static void main(String[] args) { // Open input/output files and process line by line try (Formatter output = new Formatter(OUTPUT_FILENAME)) { try (Scanner input = new Scanner(Paths.get(INPUT_FILENAME))) { // Process each line while (input.hasNextLine()) { output.format("%s%n", processContactEntry(input.nextLine())); } } catch (IOException ex) { System.err.println("Unable to open input file: " + INPUT_FILENAME); ex.printStackTrace(); } } catch (FileNotFoundException ex) { System.err.println("Unable to open output file: " + OUTPUT_FILENAME); ex.printStackTrace(); } } }

Answer 1

THE CODE FOR THE ABOVE PROBLEM IS:-

import java.io.FileNotFoundException;

import java.io.IOException;

import java.nio.file.Paths;

import java.util.Formatter;

import java.util.Scanner;

// import sun.reflect.generics.reflectiveObjects.NotImplementedException;

public class ContactListUpdater {

    private static final String INPUT_FILENAME = "contacts.txt";

    private static final String OUTPUT_FILENAME = "updated-contacts.txt";

    /** * Transforms a String containing a contact entry to a new format */

    public static String processContactEntry(String input) {

        //splitting the sentence by comma into a string array

        String arr[] = input.split(",");

        String str = "";

        // adding the result to a string str in the resulted format

        str = arr[2] + "," + arr[1] + ",<" + arr[3] + ">";

        return str;

    }

    public static void main(String[] args) {

        // Open input/output files and process line by line

        try (Formatter output = new Formatter(OUTPUT_FILENAME)) {

            try (Scanner input = new Scanner(Paths.get(INPUT_FILENAME))) { // Process each line

                while (input.hasNextLine()) {

                    output.format("%s%n", processContactEntry(input.nextLine()));

                }

            } catch (IOException ex) {

                System.err.println("Unable to open input file: " + INPUT_FILENAME);

                ex.printStackTrace();

            }

        } catch (FileNotFoundException ex) {

            System.err.println("Unable to open output file: " + OUTPUT_FILENAME);

            ex.printStackTrace();

        }

    }

}

FOR BETTER UNDERSTANDING PLEASE GO THROUGH THE SCREENSHOT BELOW:-

NOW INPUT AND OUTPUT: