Question

Implement a Java application for the following:

1.) Keep track of a movie collection.

2.) Each movie in the collection will contain: Title, Genre, Year (4 digits) and Runtime (double - ex. 2.1 (hrs)).

3.) Program will read movies from a local text file named movies.txt in the current project directory in Eclipse.

4.) Each line in the text file contains one movie, containing each field, per line.separated by commas.

5.) Read the text file and load the movies into a Collection (class).

6.) Implement a Comparator for the Movie class that can sort the movies in ascending order of Title+Year. Sort the movies read from the text file (movies.txt) in ascending order of Title+Year and write the sorted Collection to a file called sortedmovies.txt in the same directory as movies.txt.

Answer 1

If you have any problem with the code feel free to comment.

Program

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

class Movie {
   // instance variables
   private String title, genre;
   private int year;
   private double runtime;

   // constructor
   public Movie(String title, String genre, int year, double runtime) {
       this.title = title;
       this.genre = genre;
       this.year = year;
       this.runtime = runtime;
   }

   // all getters and setters
   public String getTitle() {
       return title;
   }

   public void setTitle(String title) {
       this.title = title;
   }

   public String getGenre() {
       return genre;
   }

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

   public int getYear() {
       return year;
   }

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

   public double getRuntime() {
       return runtime;
   }

   public void setRuntime(double runtime) {
       this.runtime = runtime;
   }

   @Override // string representation of movie object
   public String toString() {
       return title + "," + genre + "," + year + "," + runtime;
   }

}

public class Test {
   public static void main(String[] args) throws IOException {
//change the name and location of the text file accordingly
       Scanner sc = new Scanner(new File("data.txt"));
       BufferedWriter bw = new BufferedWriter(new FileWriter("output.txt"));

       List<Movie> moviesList = new ArrayList<Movie>();

//reading the movies
       while (sc.hasNext()) {
           String[] str = sc.nextLine().split(",");
           int year = Integer.parseInt(str[2].trim());
           double runtime = Double.parseDouble(str[3]);
           moviesList.add(new Movie(str[0], str[1], year, runtime));
       }
       sc.close();

       Comparator<Movie> comp = (i, j) -> {// using lamda expression
           int com = i.getTitle().compareTo(j.getTitle());// first comparing by title

           if (com == 0)// if title are same compare it with year
               com = (i.getYear() > j.getYear()) ? 1 : -1;

           return com;// comparing the title and year
       };

       Collections.sort(moviesList, comp);// sorting the list using comaparator

//writing the movies
       for (Movie i : moviesList) {
           bw.write(i + "");
           bw.newLine();
       }
       bw.close();
   }

}

Input

Output

1 Toy Story, Comedy, 1995 2 Sprited Away, Drama, 2001 3 The Dark Knight, Science Fiction, 2008 4 Rocky, Sports, 1976 5 King Kong, Adventure, 1993|

1 King Kong, Adventure, 1993 2 Rocky, Sports, 1976 B Sprited Away, Drama, 2001 4 The Dark Knight, Science Fiction, 2008 5 Toy Story, Comedy, 1995