Question

Complete the implementation of the Card class. The two methods that you need to complete are...

Complete the implementation of the Card class. The two methods that you need to complete are compareTo and equals.

CopareTo API: Compares this card to another card for order. This method imposes the following order on cards:

  1. Cards are first compared by rank. If the rank of this card is less than the rank of the other card then -1 is returned. If the rank of this card is greater than the rank of the other card then 1 is returned. If the ranks of the two cards are equal then the method proceeds to the next step. The ranks are compared using the compareTo method from the Rank enum.
  2. Cards are compared by suit. If the suit of this card is less than the suit of the other card then -1 is returned. If the suit of this card is greater than the suit of the other card then 1 is returned. If the suits of the two cards are equal then the method returns 0. The suits are compared using the compareTo method from the Suit enum.

Equals API: Compares this card to the specified object for equality. The result is true if obj is a card having the same rank and the same suit as this card, false otherwise.

Code:

public class Card implements Comparable<Card> {

/**

* The rank of this card.

*/

private Rank rank;

/**

* The suit of this card.

*/

private Suit suit;

public Card(Rank rank, Suit suit) {

if (rank == null || suit == null) {

throw new NullPointerException();

}

this.rank = rank;

this.suit = suit;

}

public Rank rank() {

return this.rank;

}

public Suit suit() {

return this.suit;

}

public Colour color() {

return this.suit.color();

}

@Override

public int hashCode() {

return Objects.hash(this.rank, this.suit);

}

@Override

public String toString() {

return this.rank + " of " + this.suit;

}

/*

* You need to implement the compareTo and equals methods below.

*

* For compareTo, you may compare ranks using the compareTo method

* found in the Rank class. You may compare suits using the compareTo method

* found in the Suit class.

*/

@Override

public int compareTo(Card other) {

}

@Override

public boolean equals(Object obj) {

}

}

Homework Answers

Answer #1

public class Card implements Comparable<Card> {

   /**

   * The rank of this card.

   */

   private Rank rank;

   /**

   * The suit of this card.

   */

   private Suit suit;

   public Card(Rank rank, Suit suit) {

       if (rank == null || suit == null) {

           throw new NullPointerException();

       }

       this.rank = rank;

       this.suit = suit;

   }

   public Rank rank() {

       return this.rank;

   }

   public Suit suit() {

       return this.suit;

   }

   public Colour color() {

       return this.suit.color();

   }

   @Override
   public int hashCode() {

       return Objects.hash(this.rank, this.suit);
   }

   @Override
   public String toString() {

       return this.rank + " of " + this.suit;

   }

   /*

   * You need to implement the compareTo and equals methods below.

   *

   * For compareTo, you may compare ranks using the compareTo method

   * found in the Rank class. You may compare suits using the compareTo method

   * found in the Suit class.

   */

   @Override
   public int compareTo(Card other) {
       // first compare ranks of the cards
       if(rank.compareTo(other.rank) < 0) // If the rank of this card is less than the rank of the other card then return -1
           return -1;
       else if(rank.compareTo(other,rank) > 0) // If the rank of this card is greater than the rank of the other card then return 1
           return 1;
       else // compre suits
       {
           if(suit.compareTo(other.suit) < 0) // If the suit of this card is less than the suit of the other card then return -1
               return -1;
           else if(suit.compareTo(other.suit) > 0) // If the suit of this card is greater than the suit of the other card then return 1
               return 1;
           else // If the suits of the two cards are equal then the method returns 0
               return 0;
       }  
   }

   @Override
   public boolean equals(Object obj) {
       if( obj instanceof Card) // check if obj is instance of Card class
       {
           Card card = (Card) obj; // cast obj to Card
           // return true if this card having the same rank and the same suit as this card, else false
           return((rank.compareTo(card.rank) == 0) && (suit.compareTo(card.suit) == 0));
       }
      
       return false; // return false
   }

}

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