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POusing Java interfaces
 

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    <p>I need to create interface MultiLingual, that allows to display object's data in different languages (not data itself, but introduction like "Author", "Title" etc.). </p> <p>Printed data looks like this :</p> <pre><code>3 grudnia 1998 10th of June 1924 Autor: Tolkien Tytul: LoTR Wydawnictwo: Amazon 2010 Author: Mitch Albom Title: Tuesdays with Morrie Publishing House: Time Warner Books 2003 37 360,45 PLN 5,850.70 GBP 3rd of December 1998 10th of June 1924 Author: Tolkien Title: LoTR Publishing House: Amazon 2010 Author: Mitch Albom Title: Tuesdays with Morrie Publishing House: Time Warner Books 2003 37,360.45 GBP 5,850.70 GBP </code></pre> <p>Test code looks like this :</p> <pre><code>public class Main { public static void main(String[] args){ MultiLingual gatecrasher[]={ new Data(3,12,1998), new Data(10,6,1924,MultiLingual.ENG), new Book("LoTR", "Tolkien", "Amazon", 2010), new Book("Tuesdays with Morrie", "Mitch Albom", "Time Warner Books",2003, MultiLingual.ENG), new Money(1232895/33.0,MultiLingual.PL), new Money(134566/23.0,MultiLingual.ENG), }; for(int i=0;i &lt; gatecrasher.length;i++) System.out.println(gatecrasher[i]+"\n"); for(int i=0;i &lt; gatecrasher.length;i++) System.out.println(gatecrasher[i].get(MultiLingual.ENG)+"\n"); } } </code></pre> <p>So i need to introduce constants ENG, PL in MultiLingual interface, as well as method get(int language) :</p> <pre><code>public interface MultiLingual { int ENG = 0; int PL= 1; String get(int lang); } </code></pre> <p>And then I have class Book. Problem starts with the constructors. One of them needs to take MultiLingual.ENG as argument, but how to achieve that ? Is this the proper way? :</p> <pre><code>class Book implements MultiLingual { private String title; private String publisher; private String author; public Book(String t, String a, String p, int y, MultiLingual lang){ } </code></pre> <p>Or should I treat this MultiLingual.ENG as int variable , that will just change automatically constants in interface?</p> <p>Second constructor for book doesn't take MultLingual as argument, but following implementation is somehow wrong :</p> <pre><code>public Book(String t, String a, String p, int y){ Book someBook = new Book(t, a, p, y, MultiLingual m); } </code></pre> <p>I could just send int m in place of MultiLingual m but then I will have no control if language is set to PL or ENG.</p> <p>And finally get() method for Boook but I think at least this should be working fine:</p> <pre><code>public String get(int lang){ String data; if (lang == ENG){ data = "Author: "+this.author+"\n"+ "Title: "+this.title+"\n"+ "Publisher: "+this.publisher+"\n"; } else { data = "Autor: "+this.author+"\n"+ "Tytul: "+this.title+"\n"+ "Wydawca: "+this.publisher+"\n"; } return data; } @Override public String toString(){ return ""; } } </code></pre>
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