Question

In JAVA, please

In this module, you will combine your knowledge of class objects, inheritance and linked lists. You will need to first create an object class encapsulating a Trivia Game which INHERITS from Game.

Game is the parent class with the following attributes:

1. description - which is a string

2. write the constructor, accessor, mutator and toString methods.

Trivia is the subclass of Game with the additional attributes:

1. trivia game id - integer

2. ultimate prize money - double

3. number of questions that must be answered to win - integer.

4. write the accessor, mutator, constructor, and toString methods.

Write a client class to test creating 5 Trivia objects. Once you have successfully created Trivia objects, you will continue 6B by adding a linked list of trivia objects to the Trivia class.

Answer 1

//=====================java game class================================

In this module, you will combine your knowledge of class objects, inheritance and linked lists. You will need to first create an object class encapsulating a Trivia Game which INHERITS from Game.

Game is the parent class with the following attributes:

code:

public class Game {

      

       private String description;

      

       public Game()

       {

             this.description = null;

       }

      

       public Game(String description)

       {

             this.description = description;

       }

      

       public String getDescription()

       {

             return description;

       }

      

       public void setDescription(String desc)

       {

             description = desc;

       }

      

       public String toString()

       {

             return ("Description : "+description);

       }

}

//end of Game class

// Java Trivia class

public class Trivia extends Game{

      

       private int game_id;

       private double prize_money;

       private int questions_to_win;

      

       public Trivia()

       {

             super();

             game_id = 0;

             prize_money = 0;

             questions_to_win=0;

       }

      

       public Trivia(String description,int game_id,double prize_money, int questions_to_win)

       {

             super(description);

             this.game_id = game_id;

             this.prize_money = prize_money;

             this.questions_to_win = questions_to_win;

       }

      

       public int getGameId()

       {

             return game_id;

       }

      

       public double getPrizeMoney()

       {

             return prize_money;

       }

      

       public int getNumQuestionsToWin()

       {

             return questions_to_win;

       }

      

       public void setGameId(int game_id)

       {

             this.game_id = game_id;

       }

      

       public void setPrizeMoney(double prize_money)

       {

             this.prize_money = prize_money;

       }

      

       public void setNumQuestionsToWin(int questions_to_win)

       {

             this.questions_to_win = questions_to_win;

       }

      

       public String toString()

       {

             return(super.toString()+" Game id :"+game_id+" Prize Money : "+prize_money+" Number of questions to win : "+questions_to_win);

       }

}

//end of Trivia class

// Java TriviaLinkedList class

public class TriviaLinkedList {

      

       // TriviaNode class

       class TriviaNode{

             private Trivia game;

             private TriviaNode next;

            

             public TriviaNode(Trivia game)

             {

                    this.game = game;

                    next = null;

             }

            

             public TriviaNode(Trivia game,TriviaNode next)

             {

                    this.game = game;

                    this.next = next;

             }

            

             public Trivia getGame()

             {

                    return game;

             }

            

             public TriviaNode getNext()

             {

                    return next;

             }

            

             public void setGame(Trivia game)

             {

                    this.game = game;

             }

            

             public void setNext(TriviaNode next)

             {

                    this.next = next;

             }

            

             public String toString()

             {

                    return game.toString();

             }

       } // end of TriviaNode class

      

       private TriviaNode head;

       private int num_of_items;

      

       public TriviaLinkedList()

       {

             head = null;

             num_of_items = 0;

       }

      

       public TriviaNode getHead()

       {

             return head;

       }

      

       public int getNumberOfItems()

       {

             return num_of_items;

       }

      

       public void setHead(TriviaNode head)

       {

             this.head = head;

       }

      

       // method to insert a game in the list

       public void insert(Trivia game)

       {

             if(head == null)

             {

                    head = new TriviaNode(game);

             }

             else

             {

                    TriviaNode newNode = new TriviaNode(game);

                    newNode.setNext(head);

                    head = newNode;

             }

            

             num_of_items++;

       }

      

       // method to delete the game in the list

       public void delete(int game_id)

       {

             if(head == null)

             {

                    System.out.println("\n Empty list ");

                    return;

             }

            

             if(head.getGame().getGameId() == game_id)

             {

                    head = head.getNext();

                    num_of_items--;

                    System.out.println("\n Deleted game with id : "+game_id);

             }else

             {

                    TriviaNode temp = head;

                    while(temp.getNext() != null)

                    {

                           if(temp.getNext().getGame().getGameId() == game_id )

                           {

                                 temp.setNext(temp.getNext().getNext());

                                 System.out.println("\n Deleted game with id : "+game_id);

                                 num_of_items--;

                                 return;

                           }

                          

                           temp = temp.getNext();

                    }

                   

                    System.out.println("\n Game id : "+game_id+" not present in the list");

             }

       }

      

       // method to display the list

       public void display()

       {

             if(head == null)

                    System.out.println("\n Empty list");

             else {

                    System.out.println("\n List contents : ");

                    TriviaNode temp= head;

                    while(temp!=null)

                    {

                           System.out.println(temp);

                           temp = temp.getNext();

                    }

             }

       }

}

// end of TriviaLinkedList class

// Java program to create Trivia object and insert them in linked list

public class TriviaLinkedListClient {

       public static void main(String[] args) {

            

             TriviaLinkedList list = new TriviaLinkedList(); // create the linked list

             // insert elements

             list.insert(new Trivia("Game 1",1,200,2));

             list.insert(new Trivia("Game 2",2,300,1));

             list.insert(new Trivia("Game 3",3,1000,5));

             list.insert(new Trivia("Game 4",4,5000,10));

             list.insert(new Trivia("Game 5",3,10000,20));

             list.display();

       }

}

==========================================================

output:

list contents "

Description : Game 5 Game id : 3 Prize Money : 10000.0 Number of questions to win : 20

Description : Game 4 Game id : 4 Prize Money : 5000.0 Number of questions to win : 10

Description : Game 5 Game id : 3 Prize Money : 1000.0 Number of questions to win : 5

Description : Game 5 Game id : 2 Prize Money : 300.0 Number of questions to win : 1

Description : Game 5 Game id : 1Prize Money : 200.0 Number of questions to win : 2