Question
In: Computer Science
Create a class called MovieReducerExtremes that implements MediaReducer. Implement a reducer that takes a movie list...
Create a class called MovieReducerExtremes that implements MediaReducer. Implement a reducer that takes a movie list and an option ("newest" or "oldest"), then return the newest or oldest movie as appropriate.Submit both the MovieReducerExtremes and the Movie class from the first question.
/////Required Output:///////
Newest\n 2014 AKA Jessica Jones Action \n Oldest\n 1936 Cabaret Music \n
Given Files:
Movie.java
public class Movie extends Media {
public Movie(String name, int year, String genre) {
super(name, year, genre);
}
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";
}
public boolean wasReleasedAfter(Media other) {
return getYear() > other.getYear();
}
public boolean wasReleasedBeforeOrInSameYear(Media other) {
return getYear() <= other.getYear();
}
}
Demo3.java
import java.io.FileNotFoundException;
import java.util.ArrayList;
public class Demo3
{
public static void main(String[] args) throws FileNotFoundException {
ArrayList movies = MovieLoader.loadAllMovies();
MediaReducer op = new MovieReducerExtremes();
System.out.println("Newest");
System.out.println(op.reduce(movies, "Newest"));
System.out.println("Oldest");
System.out.println(op.reduce(movies, "Oldest"));
}
}
Media.java
public abstract class Media {
private String name;
private int year;
private String genre;
public Media(String n, int y, String g) {
name = n;
year = y;
genre = g;
}
public String getName() {
return name;
}
public int getYear() {
return year;
}
public String getGenre() {
return genre;
}
public String toString() {
return String.format("%5d %-55s %-15s", year, name, genre);
}
//if the media was released on or after the year 2000, return New Millennium Era
//if the media was released on or after the year 1977, return Modern Era
//if the media was released on or after the year 1955, return Change Era
//if the media was released on or after the year 1941, return Golden Era
//in any other situation, return Pre-Golden Era
public abstract String getEra();
//return true if this media has a greater release year than the other's
public abstract boolean wasReleasedAfter(Media other);
//return true if this media was a lesser or equal release yearn than the other's
public abstract boolean wasReleasedBeforeOrInSameYear(Media other);
}
MovieLoader.java
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
public class MovieLoader {
public static ArrayList loadAllMovies() throws FileNotFoundException {
File f = new File("movie_list.txt");
Scanner inputFile = new Scanner(f);
ArrayList result = new ArrayList<>();
while (inputFile.hasNextLine()) {
String name = inputFile.nextLine();
int year = inputFile.nextInt();
//skip new line
inputFile.nextLine();
String genre = inputFile.nextLine();
Media m = new Movie(name, year, genre);
result.add(m);
}
return result;
}
}
MediaReducer
import java.util.ArrayList;
public interface MediaReducer {
public String reduce(ArrayList list, String key);
}
A couple from the movie_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 'Da Kink in My Hair 2007 Drama 'More strasti' 2000 Romance 'Ons Sterrenkookboek' 2007 Documentary 'Orrible 2001 Comedy 'Orrible 2001 Crime 'Orrible 2001 Drama 'S ann an Ile 2009 Documentary 'Sang linggo nAPO sila 1995 Game-Show 'Sang linggo nAPO sila 1995 Musical 'T Wilhelmina 1975 Comedy 'Til Death Do Us Part 2006 Crime 'Til Death Do Us Part 2006 Drama 'Til Death Do Us Part 2006 Fantasy 'Til Death Do Us Part 2006 Romance 'Til Death Do Us Part 2006 Thriller 'Til Death 2006 Comedy 'Untold 2004 Documentary 'Wag kukurap 2004 Horror 'Way Out 1961 Drama 'Way Out 1961 Horror 'Way Out 1961 Sci-Fi 'n Shrink 2009 Comedy 't Is maar TV 1999 Comedy 't Is maar TV 1999 Game-Show 't Is maar een spel 2002 Comedy 't Is maar een spel 2002 Game-Show 't Schaep Met De 5 Pooten 1969 Comedy 't Schaep Met De 5 Pooten 2006 Comedy 't Schaep Met De 5 Pooten 2006 Drama 't Zal je gebeuren... 1998 Drama 't Zonnetje in huis 1993 Comedy (S)truth 1999 Drama + Clair 2001 Documentary + Emprendedores mi+d 2010 Documentary + Investigadores 2008 Documentary + de cin�ma 2001 Documentary + de cin�ma 2001 News ... ins Gr�ne! Das Stadt-Land-Lust-Magazin 2010 Documentary ... und basta! 2006 Comedy ... und basta! 2006 Music ... und die Tuba bl�st der Huber 1981 Comedy
Solutions
Expert Solution
Here is the completed code for MovieReducerExtremes.java. 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
// MovieReducerExtremes.java
import java.util.ArrayList;
public class MovieReducerExtremes implements MediaReducer {
@Override
public String reduce(ArrayList list, String key) {
// checking if the key is newest or oldest
if (key.equalsIgnoreCase("newest")) {
// a variable to store the newest movie
Media newest = null;
// looping through each Media in list
for (int i = 0; i < list.size(); i++) {
Media m = (Media) list.get(i);
// if newest is not initialized or m is newer than newest,
// updating newest
if (newest == null || m.getYear() > newest.getYear()) {
newest = m;
}
}
// will invoke and return String returned by toString() in Media
// class
return "" + newest;
} else if (key.equalsIgnoreCase("oldest")) {
Media oldest = null;
// looping through each Media in list
for (int i = 0; i < list.size(); i++) {
Media m = (Media) list.get(i);
// if oldest is not initialized or m is older than oldest,
// updating oldest
if (oldest == null || m.getYear() < oldest.getYear()) {
oldest = m;
}
}
return "" + oldest;
}
// invalid key
return null;
}
}
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