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POSerializable ArrayList -- IOException error
 

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  1. POSerializable ArrayList -- IOException error
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    <p>The code below returns an IOException. Here's my main:</p> <pre><code>public class Main { public static void main(String[] args) { Book b1 = new Book(100, "The Big Book of Top Gear 2010", "Top Gear", "BBC Books", 120, "Book about cars."); Book b2 = new Book(200, "The Da Vinci Code", "Dan Brown", "Vatican", 450, "A fast paced thriller with riddles."); Book b3 = new Book(300, "Le Petit Nicolas", "Sempe Goscinny", "Folio", 156, "The adventures of petit Nicolas."); ArrayList&lt;Book&gt; biblia = new ArrayList&lt;Book&gt;(); biblia.add(b1); biblia.add(b2); biblia.add(b3); File f = new File("objects"); try { FileInputStream fis = new FileInputStream("objects"); int u = fis.read(); if (u != -1) { ObjectInputStream ois = new ObjectInputStream(fis); Bookstore b = (Bookstore) ois.readObject(); ois.close(); } else { Bookstore b = new Bookstore(biblia); FileOutputStream fos = new FileOutputStream("objects"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(b); oos.close(); } } catch (FileNotFoundException ex1) { System.out.println("File not found."); } catch (IOException ex2) { System.out.println("IO Error."); } catch (ClassNotFoundException ex3) { System.out.println("Class not found."); } } </code></pre> <p>This is the Bookstore class which I use just to store the ArrayList of Book objects in orded to use it in Object streams.</p> <pre><code>public class Bookstore implements Serializable { private ArrayList&lt;Book&gt; myBooks = new ArrayList&lt;Book&gt;(); public Bookstore(ArrayList&lt;Book&gt; biblia) { myBooks = biblia; } } </code></pre> <p>I've imported all the right libraries too. What I try to do is: If the file is not empty, then read the ArrayList from there (the bookstore object that contains the arraylist). If it's empty write a new one. The problem is that the only thing I get in returns is "IO Error." and I can't understand why.</p>
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    1. USAravind R. Yarram
    1. USFelice
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      1. POSerializable ArrayList -- IOException error
      1. USfastcodejava
      1. VTFavorite
    1. COYou should think more about how to test if a file exists or not :). The way you are doing it now isn't really working.
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      1. POSerializable ArrayList -- IOException error
      1. USMihai Toader
    2. COinside of your catch(IOException ex2) block, add "ex2.printStackTrace();" to get the details of where your exception is occurring.
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      1. POSerializable ArrayList -- IOException error
      1. USrobert_x44
    3. COThank you guys. It seems to work now, though I didn't change anything. :S
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      1. USFelice
 

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