Question

N JAVA

Objectives

Practice Link list, List node, compareTo, user defined data type, interfaces

Movie List

Create a link list of the movies along with the rating, number of the people who watched the movie and the genre of the movie.

Required classes

• Movie class
• ListNode class
• MovieList class
• List interface
• Driver class

Movie class implements Comparable

Attributes: movie’s name, genre, rating, number of people watched

Methods: constructor, getter, setter, equals, compreTo, toString

ListNode class

Attributes: each node has two attributes

1. Private Movie m;
2. Private ListNode next

Methods:

Constructors

public ListNode(Movie m): initializes the instance variable m
public ListNode() : empty body

public ListNode(Movie m, ListNode next): initializes the instance variables m and next

getter methods

public Movie getMovie()
public ListNode getNext()

setter methods
public void setNext(ListNode next)

List interface

public void add(String name, String ganra, int star, int people);
public void add(int index, String name, String genre, int star, int people); public int indexOf(String movieName);
public void remove(String movieName);
public int size();
public String toString();
public Movie get(int position);

MovieList implements List :

all the methods in this class must use link list concept

public class MovieList implements List
{

private ListNode front;

public static int size = 0;

//constructor

public MovieList(){}

//add the movie to the end of the list

public void add(String name, String ganra, int star, int people){}

//adds the movie at the given index

public void add(int index, String name, String ganra, int star, int people){}

//returns the movie at the given index

public int indexOf(String movieName){}

//removes the movie from the list

public void remove(String movieName){}

//returns the size of the list

public int size(){}

//create a string from all the movies in the list

public String toString(){}

//returns the movie at the given index

public Movie get (int pos){} //returns the list of the movie with the give star

public String getMovie(int star){}

//return the movie with the max number of peopel watched.

public Movie mostWatched(){}

Driver class

Make sure that your code works with the following driver. Copy and paste this class to your file.

class Driver
{

public static void main (String [] args)
{
MovieList list = new MovieList();

list.add("Reservoir Dogs", "drama",5, 20000);

list.add("Airplane", "Funny", 3, 1200);
list.add("Doctor Zhivago","comedy", 4,23000);
list.add("The Deer Hunter", "Family", 3, 2345);
System.out.println("Here is the list of the movies\n");
System.out.println(list);
System.out.println("\nhere is the the movie that was most watched");
System.out.println(list.mostWatched());
System.out.println("Here is the list of 5 stars ratings");
System.out.println(list.getMovie(5));
System.out.println("removing Reservoir movie");
list.remove("Reservior Dogs");
System.out.println(list);
System.out.println("Displaying the second movie in the list");
System.out.println(list.get(1));
System.out.println("adding a movie at position 2");
list.add(2, "Up", "Carton",3,4500);
System.out.println(list);

int i = list.indexOf("Up");

System.out.println("The movie up is in the position " + i);

}
}

Sample output

Here is the list of the movies

Reservoir Dogs, drama, *****, 20000

Airplane, Funny, ***, 1200

Doctor Zhivago, comedy, ****, 23000

The Deer Hunter, Family, ***, 2345

here is the the movie that was most watched

Doctor Zhivago, comedy, ****, 23000

Here is the list of 5 stars ratings

Reservior Dogs, drama, *****, 20000

removing Reservoir movie

Airplane, Funny, ***, 1200

Doctor Zhivago, comedy, ****, 23000

The Deer Hunter, Family, ***, 2345

Displaying the second movie in the list

Doctor Zhivago, comedy, ****, 23000

adding a movie at position 2

Airplane, Funny, ***, 1200

Doctor Zhivago, comedy, ****, 23000

Up, Carton, ***, 4500

The Deer Hunter, Family, ***, 2345

The movie up is in the position 2

Answer 1

Code:-

// List.java
public interface List
{
public void add(String name,String genre,int star,int people);
public void remove(String movieName);
public String toString();
public Movie get(int position);
}

// ListNode.java
public class ListNode
{
private Movie m;
private ListNode next;
public ListNode(Movie m)
{
this.m=m;
}
public ListNode()
{}
public ListNode(Movie m, ListNode next)
{
this.m=m;
this.next=next;
}
public Movie getMovie()
{
return m;
}
public ListNode getNext()
{
return next;
}
public void setNext(ListNode next)
{
this.next = next;
}
}

// Movie.java
class Movie implements Comparable<Movie>
{
private String name;
private String genre;
private int rating;
private int peopleWatched;
Movie(String name,String genre , int rating , int peopleWatched)
{
this.name=name;
this.genre=genre;
this.peopleWatched=peopleWatched;
this.rating=rating;
}
public String getGenre()
{
return genre;
}
public String getName()
{
return name;
}
public int getPeopleWatched()
{
return peopleWatched;
}
public int getRating()
{
return rating;
}
public void setGenre(String genre)
{
this.genre = genre;
}
public void setName(String name)
{
this.name = name;
}
public void setPeopleWatched(int peopleWatched)
{
this.peopleWatched = peopleWatched;
}
public void setRating(int rating)
{
this.rating = rating;
}
public String toString()
{
String getstars="";
int rating =getRating();
for(int i=0;i< rating ;i++)
{
getstars+="*";
}
String str =getName()+","+getGenre()+","+getstars+","+getPeopleWatched()+"\n";
return str;
}
@Override
public int compareTo(Movie m)
{
if(m.genre==genre && m.name==name && m.peopleWatched==peopleWatched && m.rating==rating )
{
return 1;
}
return 0;
}
};

// MovieList.java
public class MovieList implements List
{
private ListNode front;
public static int size=0;
public MovieList(){}
public void add(String name,String genre,int star,int people)
{
ListNode newNode = new ListNode(new Movie(name, genre, star, people), null);
if(front == null)
{
front=newNode;
return;
}
ListNode temp =front;
while(temp.getNext()!=null)
{
temp=temp.getNext();
}
temp.setNext(newNode);
size++;
}
public void add(int index,String name,String genre,int star,int people)
{
ListNode newNode = new ListNode(new Movie(name, genre, star, people), null);
ListNode temp =front;
if(index==0)
{
newNode.setNext(front);
front=newNode;
return;
}
for(int i=0;i<index-1;i++)
{
temp=temp.getNext();
}
newNode.setNext(temp.getNext());
temp.setNext(newNode);
size++;
}
public int indexOf(String movieName)
{
int count=0;
ListNode temp=front;
while(temp!=null)
{
if(temp.getMovie().getName().equals(movieName))
{
break;
}
temp=temp.getNext();
count++;
}
return count;
}
public void remove(String movieName)
{
ListNode temp=front;
ListNode temp1=temp;
if(temp.getMovie().getName().equals(movieName))
{
front=temp.getNext();
temp1.setNext(null);
return;
}
temp=temp.getNext();
while(temp!=null)
{
if(temp.getMovie().getName().equals(movieName))
{
temp1.setNext(temp.getNext());
temp.setNext(null);
break;
}
temp1=temp1.getNext();
temp=temp.getNext();
}
}
public int size()
{
return size;
}
public String toString()
{
String str="";
ListNode temp=front;
while(temp!=null)
{
str+= temp.getMovie().toString() ;
temp=temp.getNext();
}
return str;
}
public Movie get (int pos)
{
ListNode temp=front;
for(int i=0;i<pos;i++)
{
temp=temp.getNext();
}
return temp.getMovie();
}
public String getMovie(int star)
{
String str ="";
ListNode temp=front;
while(temp!=null)
{
if(temp.getMovie().getRating()==star)
{
str+=temp.getMovie().toString();
}
temp=temp.getNext();
}
return str;
}
public Movie mostWatched()
{
int mostWatched=0;
Movie m=null;
ListNode temp=front;
while(temp!=null)
{
if(temp.getMovie().getPeopleWatched() > mostWatched)
{
mostWatched =temp.getMovie().getPeopleWatched();
m=temp.getMovie();
}
temp=temp.getNext();
}
return m;
}
}

  
// Driver.java
class Driver
{
   public static void main (String [] args)
   {
       MovieList list = new MovieList();
       list.add("Reservoir Dogs", "drama",5, 20000);
       list.add("Airplane", "Funny", 3, 1200);
       list.add("Doctor Zhivago","comedy", 4,23000);
       list.add("The Deer Hunter", "Family", 3, 2345);
       System.out.println("Here is the list of the movies\n");
       System.out.println(list);
       System.out.println("\nhere is the the movie that was most watched");
       System.out.println(list.mostWatched());
       System.out.println("Here is the list of 5 stars ratings");
       System.out.println(list.getMovie(5));
       System.out.println("removing Reservoir movie");
       list.remove("Reservior Dogs");
       System.out.println(list);
       System.out.println("Displaying the second movie in the list");
       System.out.println(list.get(1));
       System.out.println("adding a movie at position 2");
       list.add(2, "Up", "Carton",3,4500);
       System.out.println(list);
       int i = list.indexOf("Up");
       System.out.println("The movie up is in the position " + i);
   }
}

Output:-

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