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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?

Database System Concepts
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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  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. #### 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`.
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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