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?
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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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?
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.
#### Class Diagram: PlayingCard
The diagram below illustrates the structure of a `PlayingCard` class in Java, highlighting its data fields and methods:
| PlayingCard |
|-----------------------|
| - cardRank: Rank |
| - cardSuit: Suit |
| + setRank(Rank rank): void |
| + setSuit(Suit suit): void |
| + getRank(): Rank |
| + getSuit(): Suit |
- **Class Name:** PlayingCard
- **Data Fields:**
- `- cardRank: Rank` (Private field storing the rank of the card)
- `- cardSuit: Suit` (Private field storing the suit of the card)
- **Methods:**
- `+ setRank(Rank rank): void` (Public method to set the rank of the card)
- `+ setSuit(Suit suit): void` (Public method to set the suit of the card)
- `+ getRank(): Rank` (Public method to get the rank of the card)
- `+ getSuit(): Suit` (Public method to get the suit of the card)
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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