Question

Needs Help with Java Programming language!

Lights Camera

Action Purpose: To learn the basics of linked lists

You are to implement 2 classes, Scene and Movie.

The Scene class has the following fields and methods:

private String event

private Scene nextScene

Public Scene(String event) - A constructor that creates a Scene object with the event set and nextScene set to null

Public Scene(String event, Scene next) - A constructor that creates a Scene object with the event and the nextScene fields set

public Scene getNextScene() - returns the nextScene after the current one

public void setNextScene(Scene newScene) - changes the nextScene to the Scene passed in

public String getEvent() - returns the event from the current scene

Your Movie class has the following fields and methods:

public Scene script- that stores a linked list of Scenes

Public Movie() - A Movie constructor which initializes the the script variable to null

public void addScene(String event) - A method that adds a new Scene to the end of the Movie’s script. If there are no Scenes in the script then the Scene added becomes the first Scene in the movie

public void addScene(String event, int pos) - A method that adds a new Scene to the Movie’s script at the position passed in, if there are not at least pos scenes in the movie return and don’t do anything

EX: If i try to addScene(“asdf”,8) but there are only 3 scenes in the movie return nothing and don’t add the string

Note: The linked list is indexed starting from 0 so we have 0,1,2,3,4...

public Scene removeScene() - A method that removes a Scene from the end of the Movie’s script, and returns the removed object. If there are no Scenes in the script then don’t do anything and return null

public Scene removeScene(int pos) - A method that removes the Scene at the passed in position from the Movie’s script, and returns the removed object.

If there is not a Scene at pos then don’t do anything and return null EX: if I try removeScene(8) but there are only 3 scenes in the movie return null

Note: The linked list is indexed starting from 0 so we have 0,1,2,3,4...

public String toString() - returns a string where each Scene’s event is separated by a comma and space. Ex: “event1, event2, event3”

You also need to create a Driver class with a main method.

In main:

Create a Movie object

Add Scenes until the Movie is:

“Introduction”,”Magic Man”,”Betrayal”,”Climax”,”Evil Defeated”,”Conclusion”

Print out the script of the Movie object using toString()

Remove the “Conclusion” of the Movie

Print out the script of the Movie object using toString()

Add a scene to the end of the movie called “Sequel”

Print out the script of the Movie object using toString()

Remove “Evil Defeated” from the Movie since the sequel retconned it

Print out the script of the Movie object using toString()

Add a Scene called “Prequel” to the beginning of the Movie

Print out the script of the Movie object using toString()

Example Output:

“Introduction”,”Magic Man”,”Betrayal”,”Climax”,”Evil Defeated”,”Conclusion”

“Introduction”,”Magic Man”,”Betrayal”,”Climax”,”Evil Defeated”

“Introduction”,”Magic Man”,”Betrayal”,”Climax”,”Evil Defeated”,”Sequel”

“Introduction”,”Magic Man”,”Betrayal”,”Climax”,”Sequel”

“Prequel”,“Introduction”,”Magic Man”,”Betrayal”,”Climax”,”Sequel”

Answer 1

Below is your code

public class Scene {
   private String event;
   private Scene nextScene;
  
   public Scene(String event) {
       this.event = event;
       this.nextScene=null;
   }

   public Scene(String event, Scene nextScene) {
       this.event = event;
       this.nextScene = nextScene;
   }

   public Scene getNextScene() {
       return nextScene;
   }

   public void setNextScene(Scene nextScene) {
       this.nextScene = nextScene;
   }

   public String getEvent() {
       return event;
   }   
}

import java.util.LinkedList;

public class Movie {

   public LinkedList<Scene> script=new LinkedList<Scene>();
   public Movie() {

   }
   public void addScene(String event) {
       Scene sc=new Scene(event);
       script.add(sc);
   }
   public void addScene(String event, int pos) {
       if(script.size()>pos) {
           Scene sc=new Scene(event);
           script.add(pos, sc);
       }
   }
   public Scene removeScene() {
       if(script.size()>=1) {
           return script.remove(script.size()-1);
       }
       return null;      
   }
   public Scene removeScene(int pos) {
       if(script.size()>pos) {
           return script.remove(pos);
       }
       return null;
   }
   public String toString() {
       String retstr="";
       int i=0;
       for(Scene s:script) {
           retstr=retstr+"\""+s.getEvent()+"\"";
           i++;
           if(script.size()!=i) {
           retstr=retstr+", ";
           }
       }
       return retstr;
   }
}

public class MovieSceneDriver {

   public static void main(String[] args) {

       Movie m=new Movie();
       m.addScene("Introduction");
       m.addScene("Magic Man");
       m.addScene("Betrayal");
       m.addScene("Climax");
       m.addScene("Evil Defeated");
       m.addScene("Conclusion");
       System.out.println(m.toString());
       m.removeScene();
       System.out.println(m.toString());
       m.addScene("Sequel");
       System.out.println(m.toString());
       m.removeScene(4);
       System.out.println(m.toString());
       m.addScene("Prequel", 0);
       System.out.println(m.toString());
   }
}