Question

Hi there,

I am having a bit of an issue that I just can't seem to figure it out. My code is supposed to read from another file and then have an output of a number for each categorie

////////Required Output///////

Movies in Silent Era: 0\n
Movies in Pre-Golden Era: 7\n
Movies in Golden Era: 581\n
Movies in Change Era: 3445\n
Movies in Modern Era: 10165\n
Movies in New Millennium Era: 15457\n

My program is:

import java.util.ArrayList;

public class MovieReducerEraCount implements MediaReducer
{
    private String result;

    public String reduce(ArrayList<Media> list, String era)
    {
        this.result = result;

        int counter = 0;

        for (int year = 0; year < list.size(); year++)
        {
            
            if (list.get(year).getName().equals(era))

            {
                counter++;
            }
        }

        result = "Movies in " + era + ": " + counter;

        return result;

    }

}

/////////Movie.java//////////

public class Movie extends Media
{
    public Movie(String name, int year, String genre)
    {
        super(name, year, genre);
    }

    @Override

    public String getEra()
    {
        if (getYear() >= 2000)
        {
            return "New Millennium Era";
        } else if (getYear() >= 1977)
        {
            return "Modern Era";
        } else if (getYear() >= 1955)
        {
            return "Change Era";
        } else if (getYear() >= 1941)
        {
            return "Golden Era";
        }
        return "Pre-Golden Era";
    }

    @Override

    public boolean wasReleasedAfter(Media other)
    {
        return getYear() > other.getYear();
    }

    @Override

    public boolean wasReleasedBeforeOrInSameYear(Media other)
    {
        return getYear() <= other.getYear();
    }
}

///////move_list.txt///////

!Next?
1994
Documentary
#1 Single
2006
Reality-TV
#ByMySide
2012
Drama
#Follow
2011
Mystery
#nitTWITS
2011
Comedy
$#*! My Dad Says
2010
Comedy
$1,000,000 Chance of a Lifetime
1986
Game-Show
$100 Makeover
2010
Reality-TV
$100 Taxi Ride
2001
Documentary
$100,000 Name That Tune
1984
Game-Show
$100,000 Name That Tune
1984
Music
$2 Bill
2002
Documentary
$2 Bill
2002
Music
$2 Bill
2002
Music
$2 Bill
2002
Music
$2 Bill
2002
Music
$25 Million Dollar Hoax
2004
Reality-TV
$40 a Day
2002
Documentary
$5 Cover
2009
Drama
$5 Cover: Seattle
2009
Drama
$50,000 Letterbox
1980
Game-Show
$9.99
2003
Adventure
$weepstake$
1979
Drama
' Horse Trials '
2011
Sport
'80s Videos: A to Z
2009
Music
'Allo 'Allo!
1982
Comedy
'Allo 'Allo!
1982
War
'Conversations with My Wife'
2010
Comedy
'Da Kink in My Hair
2007
Comedy

I've shorten the file.

Answer 1

/***************************MediaReducer.java*****************************/

import java.util.ArrayList;

public interface MediaReducer {

   public String reduce(ArrayList<Media> list, String era);
}

/***********************************MediaReducerEraCount.java*************************************/

import java.util.ArrayList;

public class MovieReducerEraCount implements MediaReducer {

   public String reduce(ArrayList<Media> list, String era) {

       String result = "";

       int counter = 0;

       for (Media media : list) {

           if (media.getEra().equalsIgnoreCase(era)) {

               counter++;
           }
       }
       result = "Movies in " + era + ": " + counter;

       return result;

   }

}

/*******************************************Media.java**********************************/

public abstract class Media {

   private String name;
   private int year;
   private String genre;

   public Media(String name, int year, String genre) {

       this.name = name;
       this.year = year;
       this.genre = genre;
   }

   public final String getName() {
       return name;
   }

   public final void setName(String name) {
       this.name = name;
   }

   public final int getYear() {
       return year;
   }

   public final void setYear(int year) {
       this.year = year;
   }

   public final String getGenre() {
       return genre;
   }

   public final void setGenre(String genre) {
       this.genre = genre;
   }

   public abstract String getEra();

   public abstract boolean wasReleasedAfter(Media other);

   public abstract boolean wasReleasedBeforeOrInSameYear(Media other);

}
/********************************************Movie.java***********************************/

public class Movie extends Media {
   public Movie(String name, int year, String genre) {
       super(name, year, genre);
   }

   @Override

   public String getEra() {
       if (getYear() >= 2000) {
           return "New Millennium Era";
       } else if (getYear() >= 1977) {
           return "Modern Era";
       } else if (getYear() >= 1955) {
           return "Change Era";
       } else if (getYear() >= 1941) {
           return "Golden Era";
       }
       return "Pre-Golden Era";
   }

   @Override

   public boolean wasReleasedAfter(Media other) {
       return getYear() > other.getYear();
   }

   @Override

   public boolean wasReleasedBeforeOrInSameYear(Media other) {
       return getYear() <= other.getYear();
   }
}

/*******************************************TestMovie.java**********************************/

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

public class TestMovie {

   public static void main(String[] args) {

       ArrayList<Media> list = new ArrayList<>();
       MediaReducer mediaReducer = new MovieReducerEraCount();
       File file = new File("move_list.txt");

       try {

           Scanner sc = new Scanner(file);
           // while loop till file has line
           while (sc.hasNextLine()) {
               // read the line
               String name = sc.nextLine();
               int year = Integer.parseInt(sc.nextLine());
               String genre = sc.nextLine();

               list.add(new Movie(name, year, genre));

           }
           sc.close();
       } catch (FileNotFoundException e) {
           e.printStackTrace();
       }

       System.out.println(mediaReducer.reduce(list, "Silent Era"));
       System.out.println(mediaReducer.reduce(list, "Pre-Golden Era"));
       System.out.println(mediaReducer.reduce(list, "Golden Era"));
       System.out.println(mediaReducer.reduce(list, "Change Era"));
       System.out.println(mediaReducer.reduce(list, "Modern Era"));
       System.out.println(mediaReducer.reduce(list, "New Millennium Era"));

   }

}

/*********************************************output***************************/

Movies in Silent Era: 0
Movies in Pre-Golden Era: 0
Movies in Golden Era: 0
Movies in Change Era: 0
Movies in Modern Era: 8
Movies in New Millennium Era: 21

Please let me know if you have any doubt or modify the answer, Thanks :)