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POJava Inheritance and Understanding Interface Classes
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copied!<p>I am working on a short java assignment that I have been set.</p> <p>The question is as follows:</p> <blockquote> <p>Design and write classes to model different types of Publications in a Library. Consider carefully the different types of publications, e.g. Books and Magazines. Put all attributes and methods which are common to all types of Publications in a super-class, and then extend this super-class appropriately to create a set of sub-classes. </p> </blockquote> <p>Make sure that you include appropriate constructor, getter, setter and customised methods in your classes. Use method overloading and overriding where appropriate.</p> <p>Make maximum use of inheritance in your design and class code.</p> <p>Implement the following Interface Class in your design and coding:</p> <pre><code>+ getPublisher() : String + getPublicationTitle() : String + getPrice : float + setPublication(publisherIn: String, titleIn:String, priceIn:float) : void </code></pre> <p><strong>So I have answered it as best I can, please could anybody read it and check that I am on the right track and understand what I am meant to be doing, it seems fat to simple to be correct? Oh and javadocs are not finished yet [=</strong></p> <pre><code>public interface PublicationInterface { /** * Returns the book publisher name (as a String) */ public String getPublisher(); /** * Returns the book publication title (as a String) */ public String getPublicationTitle(); /** * Returns the book price (as a float) */ public float getPrice(); /** * Sets the book publication details. * * @param publisherIn The Book Publisher (as a String) * @param titleIn The Book Title (as a String) * @param priceIn The Book Price (as a float) */ public void setPublication(String publisherIn, String publicationTitleIn, float priceIn); } abstract public class Publications implements PublicationInterface { // Attributes protected String publisher; protected String publicationTitle; protected float price; public Publications(String publisherIn, String publicationTitleIn, float priceIn) { publisher = publisherIn; publicationTitle = publicationTitleIn; price = priceIn; } public String getPublisher() { return (publisher); } public String getPublicationTitle() { return (publicationTitle); } public float getPrice() { return (price); } public void setPublication(String publisherIn, String publicationTitleIn, float priceIn) { publisher = publisherIn; publicationTitle = publicationTitleIn; price = priceIn; } } public class Magazine extends Publications { String editor; String date; public Magazine(String publisherIn , String publicationTitleIn, float priceIn, String editorIn, String dateIn) { super (publisherIn , publicationTitleIn, priceIn); editor = editorIn; date = dateIn; } public void setPublication(String publisherIn, String publicationTitleIn, float priceIn) { publisherIn = publisher; publicationTitleIn = publicationTitle; priceIn = price; } public String getEditor() { System.out.println("The editor of this magazine is " + editor); return (editor); } public String getDate() { System.out.println("The publication date of this magazine is " + date); return (date); } public String getPublisher() { System.out.println("The publisher of this magazine is " + publisher); return (publisher); } public String getPublicationTitle() { System.out.println("The publication title of this magazine is " + publicationTitle); return (publicationTitle); } public float getPrice() { System.out.println("The price of this magazine is £" + price); return (price); } } public class ReferenceMaterial extends Publications { String genre; String subject; public ReferenceMaterial(String publisherIn , String publicationTitleIn, float priceIn, String genreIn, String subjectIn) { super (publisherIn , publicationTitleIn, priceIn); genre = genreIn; subject = subjectIn; } public String getGenre() { System.out.println("The genre of this material is " + genre); return (genre); } public String getSubject() { System.out.println("The subject of this material is " + subject); return (subject); } public String getPublisher() { System.out.println("The publisher of this material is " + publisher); return (publisher); } public String getPublicationTitle() { System.out.println("The publication title of this material is " + publicationTitle); return (publicationTitle); } public float getPrice() { System.out.println("The price of this material is £" + price); return (price); } } public class Book extends Publications { int pageNumber; String author; public Book(String publisherIn , String publicationTitleIn, float priceIn, int pageNumberIn, String authorIn) { super (publisherIn , publicationTitleIn, priceIn); pageNumber = pageNumberIn; author = authorIn; } public int getPageNumber() { System.out.println("The number of pages in this book are " + pageNumber); return (pageNumber); } public String getAuthor() { System.out.println("The author of this book is " + author); return (author); } public String getPublisher() { System.out.println("The publisher of this book is " + publisher); return (publisher); } public String getPublicationTitle() { System.out.println("The publication title of this book is " + publicationTitle); return (publicationTitle); } public float getPrice() { System.out.println("The price of this book is £" + price); return (price); } } public class TestLibrary { public static void main() { Magazine magazine1 = new Magazine ("SanYonic Publishing", "Ayup Magazine", 99, "Yeshumenku Suni", "12/09/2011"); System.out.println(); magazine1.getEditor(); magazine1.getDate(); magazine1.getPublisher(); magazine1.getPublicationTitle(); magazine1.getPrice(); System.out.println(); ReferenceMaterial referenceMaterial1 = new ReferenceMaterial ("Dorling kindesy", "killer Sharks In The Solent", 200, "Nature", "Sharks"); referenceMaterial1.getGenre(); referenceMaterial1.getSubject(); referenceMaterial1.getPublisher(); referenceMaterial1.getPublicationTitle(); referenceMaterial1.getPrice(); System.out.println(); Book Book1 = new Book ("Hodder & Soughton", "One Day", 75, 1105, "David Nicholls"); Book1.getPageNumber(); Book1.getAuthor(); Book1.getPublisher(); Book1.getPublicationTitle(); Book1.getPrice(); System.out.println(); } } </code></pre>

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