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/*******************************************************************************
* Companion code for the book "Introduction to Software Design with Java"
* by Martin P. Robillard.
*
* Copyright (C) 2019 by Martin P. Robillard
*
* This code is licensed under a Creative Commons
* Attribution-NonCommercial-NoDerivatives 4.0 International License.
*
* See http://creativecommons.org/licenses/by-nc-nd/4.0/
*******************************************************************************/
package chapter4;
import java.util.HashSet;
/**
* Implementation of a playing card. This class yields immutable objects.
* This version of the class is checkable for quality.
*/
public class Card5
{
/* Code that relies on the equals and hashCode methods */
public static void main(String[] args)
{
Card5 card1 = new Card5(Rank.ACE, Suit.CLUBS);
Card5 card2 = new Card5(Rank.ACE, Suit.DIAMONDS);
Card5 card3 = new Card5(Rank.ACE, Suit.CLUBS);
HashSet<Card5> set = new HashSet<>();
set.add(card1);
set.add(card2);
assert card1.equals(card3);
assert set.size() == 2;
assert !set.add(card3);
System.out.println("No errors");
}
private Rank aRank;
private Suit aSuit;
/**
* Creates a new card object.
*
* @param pRank The rank of the card.
* @param pSuit The suit of the card.
* @pre pRank != null
* @pre pSuit != null
*/
public Card5(Rank pRank, Suit pSuit)
{
assert pRank != null && pSuit != null;
aRank = pRank;
aSuit = pSuit;
}
/**
* @return The rank of the card.
*/
public Rank getRank()
{
return aRank;
}
/**
* @return The suit of the card.
*/
public Suit getSuit()
{
return aSuit;
}
@Override
public int hashCode()
{
return aSuit.ordinal() * Rank.values().length + aRank.ordinal();
}
@Override
public boolean equals(Object pObject)
{
if(this == pObject)
{
return true;
}
if(pObject == null || getClass() != pObject.getClass())
{
return false;
}
Card5 other = (Card5) pObject;
return aSuit == other.aSuit && aRank == other.aRank;
}
}