EBK DATABASE CONCEPTS
7th Edition
ISBN: 9780133777840
Author: AUER
Publisher: VST
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Textbook Question
Chapter 4, Problem 4.8RQ
Explain the difference between an entity class and an entity instance.
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What is a strong entity type?
Explain the concept of interface inheritance and how it differs from class inheritance. Provide examples to illustrate the differences.
Create a base class called Entity. The Entity class must hold the common attributes and behaviors from UML.
Entity Class UML
Entity
-id: long
-name: String
--------------------------------
-Enity()
+Entity(id: long, name: String)
+getId(): long
+getName(); String
+toString(): String
Complete the code for the Player and Team classes. Each class must derive from the Entity class.
Refactor the Game class to inherit from this new Entity class.
Every team and player must have a unique name by searching for the supplied name prior to adding the new instance. Use the iterator pattern in the addTeam() and addPlayer() methods.
Code that I have, not sure if I have it correct. Thank you
Entity Class
package com.gamingroom;
public class Entity {//Private attributesprivate long id;private String name;//Default constructorpublic Entity() {
}//Constructor with an identifier and namepublic Entity(long id, String name) {this();this.id = id;this.name = name;}
//@return the idpublic long getId() {return…
Chapter 4 Solutions
EBK DATABASE CONCEPTS
Ch. 4 - Prob. 4.1RQCh. 4 - Prob. 4.2RQCh. 4 - Prob. 4.3RQCh. 4 - What is a use case, and what is its purpose?Ch. 4 - Give an example of a data constraint.Ch. 4 - Prob. 4.6RQCh. 4 - Define the term entity, and give an example other...Ch. 4 - Explain the difference between an entity class and...Ch. 4 - Define the term attribute, and give examples for...Ch. 4 - Define the term identifier, and indicate which...
Ch. 4 - Prob. 4.11RQCh. 4 - Prob. 4.12RQCh. 4 - Prob. 4.13RQCh. 4 - Prob. 4.14RQCh. 4 - List and give an example of the three types of...Ch. 4 - Prob. 4.16RQCh. 4 - Prob. 4.17RQCh. 4 - Prob. 4.18RQCh. 4 - Define the term weak entity, and give an example...Ch. 4 - Explain the ambiguity in the definition of the...Ch. 4 - Define the term associative entity, and give an...Ch. 4 - Define the terms supertype, subtype, and...Ch. 4 - What is an exclusive subtype relationship? Give an...Ch. 4 - What is an inclusive subtype relationship? Give an...Ch. 4 - Prob. 4.25RQCh. 4 - Prob. 4.26RQCh. 4 - Prob. 4.27RQCh. 4 - Prob. 4.28RQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.Similar questions
- What characteristics define a strong use case? Use cases and their properties have certain commonalities?arrow_forwardDraw the shape used in the object-based logical model of the following. a. Attributes b. Entity sets c. Links d. Relationshipsarrow_forwardExplain the concept of "computed properties" in data binding frameworks and their role in optimizing application performance.arrow_forward
- Consider the scenario described by the statement "A customer can make many payments, but each payment is made by only one customer." Use this scenario as the basis for an Object-Oriented Data Model (OODM). Use the figure shown as a guide to create the OODM.arrow_forwardRefer to imagearrow_forwardWhat are the distinguishing elements of a good use case? There are some similarities between use cases and their attributes.arrow_forward
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Enhanced Entity Relationship Model; Author: Data Science Center;https://www.youtube.com/watch?v=ocQUtXPumdQ;License: Standard YouTube License, CC-BY