Question

Write a Java program in Eclipse that reads from a file, does some clean up, and then writes the “cleaned” data to an output file.

• Create a class called FoodItem. This class should have the following:
  • A field for the item’s description.
  • A field for the item’s price.
  • A field for the item’s expiration date.
  • A constructor to initialize the item’s fields to specified values.
  • Getters (Accessors) for each field.
  • This class should implement the Comparable interface so that food items can be compared by date.
• Create a text file called input.txt to contain a file of food items. Each line should be one and only one food item record and should have the following format, with each field being separated by white space:
  • The first field should be the description.
  • The second field should be the price.
  • The third field should be the expiration month.
  • The fourth field should be the expiration day.
  • The fifth filed should be the expiration year.
  • Create a file of twenty records.
  • The records must be in any unsorted order.

• Create a Driver class that does the following:
  • Uses an ArrayList to store a collection of FoodItem objects.
  • Use a loop to read each record from the file. It may be easiest to read each record as an entire line, save it as a String and then use a scanner to scan the string for each field.
  • You need to create a Date object from the date fields. Fields: ( day = d; month = m; year = y;) and (int d, int m, int y)
  • You need to create a Food item object from each record and add it to your ArrayList.
  • You will then remove each food item from the ArrayList that has an expiration date before 5/1/2019. Remember, you need to use a while loop with an iterator to do this.
  • You will then sort then remaining food items by expiration date using Collections.sort.
  • You will then write each record remaining in the array list to a file called output.txt in the same format as specified for the input file.

Answer 1

/********************************FoodItem.java****************************/

import java.util.Date;

public class FoodItem implements Comparable<FoodItem> {

   /*
   * data field
   */
   private String itemDesc;
   private double itemPrice;
   private Date expDate;

   /**
   *
   * @param itemDesc
   * @param itemPrice
   * @param expDate
   */
   public FoodItem(String itemDesc, double itemPrice, Date expDate) {
       super();
       this.itemDesc = itemDesc;
       this.itemPrice = itemPrice;
       this.expDate = expDate;
   }

   public String getItemDesc() {
       return itemDesc;
   }

   public double getItemPrice() {
       return itemPrice;
   }

   public Date getExpDate() {
       return expDate;
   }

   @Override
   public String toString() {
       return itemDesc + ", itemPrice=" + itemPrice + ", expDate=" + expDate;
   }

   @Override
   public int compareTo(FoodItem o) {

       if (this.expDate.after(o.expDate)) {
           return -1;
       } else if (this.expDate.before(o.expDate)) {
           return 1;
       } else {
           return 0;
       }
   }

}
/*****************************Driver.java***********************************************/

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.Scanner;

public class Driver {

   public static void main(String[] args) {

       /*
       * array list to store food items
       */
       ArrayList<FoodItem> foodItems = new ArrayList<>();
       // to set date format
       DateFormat df = new SimpleDateFormat("MM/dd/yyyy");
       /*
       * read file input.txt
       */
       File f = new File("input.txt");
       Scanner r = null;
       try {
           r = new Scanner(f);
           String line;
           int i = 0;
           while (r.hasNextLine()) {
               line = r.nextLine();
               String[] array = line.split(" ");

               String itemDesc = array[0];
               double itemPrice = Double.parseDouble(array[1]);
               int m = Integer.parseInt(array[2]);
               int d = Integer.parseInt(array[3]);
               int y = Integer.parseInt(array[4]);

               Date d1 = null;
               try {
                   d1 = df.parse(m + "/" + d + "/" + y);
               } catch (ParseException e) {
                   e.printStackTrace();
               }
               foodItems.add(new FoodItem(itemDesc, itemPrice, d1));

           }
       } catch (FileNotFoundException ex) {
           System.out.println("File not found!");
       }

       /*
       * show data of input.txt
       */
       for (FoodItem foodItem : foodItems) {

           System.out.println(foodItem.toString());
       }

       /*
       * remove item before 05/01/2019
       */
       Iterator<FoodItem> itr = foodItems.iterator();
       while (itr.hasNext()) {
           FoodItem item = (FoodItem) itr.next();
           try {
               if (item.getExpDate().before(df.parse("05/01/2019")))
                   itr.remove();
           } catch (ParseException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
           }
       }

       /*
       * sort the array
       */
       Collections.sort(foodItems);

       /*
       * write to file
       */
       try {
           FileWriter fw = new FileWriter("output.txt");
           for (FoodItem foodItem : foodItems) {

               fw.write(foodItem.toString() + "\n");
           }
           fw.close();
       } catch (Exception e) {
           System.out.println(e);
       }
       System.out.println("Data Successfully written...");

   }
}
/*******************input.txt*****************************/

Butter 34.5 12 06 2018
Milk 34.5 02 10 2019
Juice 34.5 03 06 2019
Water 34.5 04 10 2019
Oil 34.5 11 09 2019
Biscuit 34.5 12 08 2019
Poison 34.5 06 07 2019
Butter 34.5 08 06 2018
Butter 34.5 09 06 2020
Juice 34.5 03 06 2018
Water 34.5 04 10 2018
Oil 34.5 11 09 2018
/******************************output.txt***************************/

Butter, itemPrice=34.5, expDate=Sun Sep 06 00:00:00 IST 2020
Biscuit, itemPrice=34.5, expDate=Sun Dec 08 00:00:00 IST 2019
Oil, itemPrice=34.5, expDate=Sat Nov 09 00:00:00 IST 2019
Poison, itemPrice=34.5, expDate=Fri Jun 07 00:00:00 IST 2019
/**********************console**************************/

Butter, itemPrice=34.5, expDate=Thu Dec 06 00:00:00 IST 2018
Milk, itemPrice=34.5, expDate=Sun Feb 10 00:00:00 IST 2019
Juice, itemPrice=34.5, expDate=Wed Mar 06 00:00:00 IST 2019
Water, itemPrice=34.5, expDate=Wed Apr 10 00:00:00 IST 2019
Oil, itemPrice=34.5, expDate=Sat Nov 09 00:00:00 IST 2019
Biscuit, itemPrice=34.5, expDate=Sun Dec 08 00:00:00 IST 2019
Poison, itemPrice=34.5, expDate=Fri Jun 07 00:00:00 IST 2019
Butter, itemPrice=34.5, expDate=Mon Aug 06 00:00:00 IST 2018
Butter, itemPrice=34.5, expDate=Sun Sep 06 00:00:00 IST 2020
Juice, itemPrice=34.5, expDate=Tue Mar 06 00:00:00 IST 2018
Water, itemPrice=34.5, expDate=Tue Apr 10 00:00:00 IST 2018
Oil, itemPrice=34.5, expDate=Fri Nov 09 00:00:00 IST 2018
Data Successfully written...

a Driver.java D Foodltem.java input.tt 0utput.txt X 1 Butter, itemPrice-34.5, expDate-Sun SeR 96 00:00:00 IST 2020 2 Biscuit, itemPrice-34.5, expDate-Sun Res 88 98:00:00 IST 2019 3 0il, itemPrice-34.5, expDate-Sat Nov 09 00:00:00 IST 2019 4 Poison, İtemPrice-34.5, expDate-Fri lun 07 00:00:00 IST 2019 E ConsoleX <terminated> Driver (1) [Java Application] C:\Program Files Java\jre1.8.0_131\bin javaw.exe (Ma Butter, itemPrice=34.5, expDate=Thu Dec 06 00:00:00 IST 2018 Milk, itemPrice-34.5, expDate-Sun Feb 10 00:00:00 IST 2019 Juice, itemPrice-34.5, expDate-Wed Mar 06 00:00:00 IST 2019 Water, itemPrice-34.5, expDate-Wed Apr 10 00:00:00 IST 2019 Oil, itemPrice-34.5, expDate-Sat Nov 09 00:00:00 IST 2019 Biscuit, itemPrice-34.5, expDate-Sun Dec 08 00:00:00 IST 2019 Poison, itemPrice-34.5, expDate-Fri Jun 07 00:00:00 IST 2019 Butter, itemPrice-34.5, expDate-Mon Aug 06 00:00:00 IST 2018 Butter, itemPrice-34.5, expDate=Sun Sep 06 00:00:00 IST 2020 Juice, itemPrice-34.5, expDate-Tue Mar 06 08:00:00 IST 2018 Water, itemPrice-34.5, expDate-Tue Apr 10 00:00:00 IST 2018 Oil, itemPrice-34.5, expDate-Fri Nov 09 00:00:00 IST 2018 Data Successfully written...

Thanks a lot, Please let me know if you have any problem...................