Question

Step 1:

Create a new Java project in NetBeans called “Wedding1”

Step 2:

Use appropriate data types to store the following information:

• The names of the bride and groom
• The total number of guests at the wedding
• The square footage of the location (must be accurate to 0.1 square feet).
• The names of each song in the DJ's playlist. You should use an ArrayList of Strings to store this, and the user should be able to enter as many song names as they wish.
• The number of guests per square foot of the location.

Step 3:

Add static methods to:

• Prompt the user for the names of the bride and groom
• Prompt the user for number of guests at the wedding
• Prompt the user for the square footage of the location
• Prompt the user for names of each song in the DJ's playlist
• Calculate and display the number of guests per square foot of the location.

Step 4:

Add functionality to:

• Save all data to a file called wedding.txt
• Load and display the contents of this file

Note: please use basic exception handling (i.e. a try block) when attempting to access a file.

Step 5:

Add logic to your main() method that uses all of the methods you’ve created in order to prompt the user for values, store their responses, save those values to a file, and display the contents of the file.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// Wedding.java

import java.io.File;

import java.io.FileNotFoundException;

import java.io.PrintWriter;

import java.util.ArrayList;

import java.util.Scanner;

public class Wedding {

      // scanner for reading user input from keyboard

      static Scanner keyboard = new Scanner(System.in);

      // reads and returns the bride's name

      static String getBrideName() {

            System.out.print("Enter bride's name: ");

            String bride = keyboard.nextLine();

            return bride;

      }

      // reads and returns the groom's name

      static String getGroomName() {

            System.out.print("Enter groom's name: ");

            String groom = keyboard.nextLine();

            return groom;

      }

      // reads and returns the number of guests

      static int getNumGuests() {

            System.out.print("Enter number of guests: ");

            int guests = Integer.parseInt(keyboard.nextLine());

            return guests;

      }

      // reads and returns the square footage

      static double getSquareFootage() {

            System.out.print("Enter square footage of the location: ");

            double sqft = Double.parseDouble(keyboard.nextLine());

            return sqft;

      }

      // reads and returns the list of songs in DJ's playlist

      static ArrayList<String> getPlayList() {

            ArrayList<String> playList = new ArrayList<String>();

            System.out.println("Enter songs in DJ's playlist in separate lines. "

                        + "Type 'done' to finish");

            String input = keyboard.nextLine();

            // looping until user enter 'done'

            while (!input.equalsIgnoreCase("done")) {

                  // adding to playlist

                  playList.add(input);

                  // reading next song name

                  input = keyboard.nextLine();

            }

            return playList;

      }

      // calculates and returns the number of guests per square foot using number

      // of guests and sqft

      static double getNumGuestsPerSquareFoot(int guests, double sqft) {

            double guestsPerSqFt = (double) guests / sqft;

            return guestsPerSqFt;

      }

      // writes all data to a file with given name

      static void saveData(String filename, String bride, String groom,

                  int numGuests, double sqft, ArrayList<String> playList,

                  double numGuestsPerSqFt) throws FileNotFoundException {

            // opening file in write mode

            PrintWriter writer = new PrintWriter(new File(filename));

            // writing all data

            writer.println("Couple: " + bride + " & " + groom);

            writer.println("Number of guests: " + numGuests);

            // displaying square footage with 1 digit precision

            writer.printf("Square footage of location: %.1f\n", sqft);

            writer.println("Playlist: ");

            // writing all songs

            for (String song : playList) {

                  writer.println("\t" + song);

            }

            // displaying number of guests per sqft with 2 digits precision

            writer.printf("Number of guests per square footage: %.2f\n",

                        numGuestsPerSqFt);

            // closing file, saving changes

            writer.close();

      }

      // loads a file and display the contents on screen

      static void loadAndPrintData(String filename) throws FileNotFoundException {

            Scanner scanner = new Scanner(new File(filename));

            while (scanner.hasNext()) {

                  System.out.println(scanner.nextLine());

            }

            scanner.close();

      }

      public static void main(String[] args) {

            // reading values in order

            String brideName = getBrideName();

            String groomName = getGroomName();

            int numGuests = getNumGuests();

            double squareFootage = getSquareFootage();

            ArrayList<String> playList = getPlayList();

            // calculating numGuestsPerSquareFoot

            double numGuestsPerSquareFoot = getNumGuestsPerSquareFoot(numGuests,

                        squareFootage);

            // opening try block, saving data to file, and loading from file,

            // displaying contents

            try {

                  saveData("wedding.txt", brideName, groomName, numGuests,

                              squareFootage, playList, numGuestsPerSquareFoot);

                  loadAndPrintData("wedding.txt");

            } catch (FileNotFoundException e) {

                  e.printStackTrace();

            }

      }

}

/*OUTPUT*/

Enter bride's name: Lyla

Enter groom's name: John

Enter number of guests: 50

Enter square footage of the location: 2000

Enter songs in DJ's playlist in separate lines. Type 'done' to finish

Faded

Hello

Coldplay

Shape of You

done

Couple: Lyla & John

Number of guests: 50

Square footage of location: 2000.0

Playlist:

      Faded

      Hello

      Coldplay

      Shape of You

Number of guests per square footage: 0.03