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Consider the PlayingCard, Rank and Suit classes.            a)Which two classes are instance variables in the third class?            b)Are instance variables an is-a or has-a relationship?

Consider the PlayingCard, Rank and Suit classes.            a)Which two classes are instance variables in the third class?            b)Are instance variables an is-a or has-a relationship?

Microsoft Visual C#
Microsoft Visual C#
7th Edition
ISBN:9781337102100
Author:Joyce, Farrell.
Publisher:Joyce, Farrell.
Chapter10: Introduction To Inheritance
Section: Chapter Questions
Problem 20RQ
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  1. Consider the PlayingCard, Rank and Suit classes.

           a)Which two classes are instance variables in the third class?

           b)Are instance variables an is-a or has-a relationship?

"Is-a" versus "Has-a" A large program will often be built out of multiple classes. Often, these classes will have a "has a" relationship. For example, a game program might include three classes: PlayingCard, Suit, and Rank. A PlayingCard object has a Suit and has a Rank, which are handled in a Java program as instance variables. PlayingCard - cardRank: Rank cardSuit: Suit + setRank (Rank rank): void + setSuit (Suit suit): void + getRank (): Rank + getSuit (): Suit Class Name Data Fields Methods Less often, you might have two classes which have an “is a” relationship, where one class is a more general class, while the second class is a more specialized version of the original class. A blackjack program might have a BlackJackCard class which is a PlayingCard. Notice the relationship is not symmetrical: every BlackJackCard is a PlayingCard, but not every PlayingCard is a BlackJackCard.
Transcribed Image Text:"Is-a" versus "Has-a" A large program will often be built out of multiple classes. Often, these classes will have a "has a" relationship. For example, a game program might include three classes: PlayingCard, Suit, and Rank. A PlayingCard object has a Suit and has a Rank, which are handled in a Java program as instance variables. PlayingCard - cardRank: Rank cardSuit: Suit + setRank (Rank rank): void + setSuit (Suit suit): void + getRank (): Rank + getSuit (): Suit Class Name Data Fields Methods Less often, you might have two classes which have an “is a” relationship, where one class is a more general class, while the second class is a more specialized version of the original class. A blackjack program might have a BlackJackCard class which is a PlayingCard. Notice the relationship is not symmetrical: every BlackJackCard is a PlayingCard, but not every PlayingCard is a BlackJackCard.
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