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POsaving/loading array of objects using java serialization
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copied!<p>I have the following class, which performs some calculations to fill its static arrays.</p> <pre><code>public class Amount implements Serializable{ private static final long serialVersionUID = 8141477444408242243L; public static Amount values1[][] = new Amount[10][30]; public static Amount values2[][] = new Amount[10][30]; public static Amount values3[][] = new Amount[10][30]; double highestValue; double highestAmount; double lowestAmount; double lowestValue; ... } </code></pre> <p>As the calculations take 20 minutes or so, I am looking to store the arrays on file and load the values when the program starts. I am attempting to use the java serialization method and have the following functions</p> <pre><code>public static void loadFile(Amount[][] arr, String filename){ try { FileInputStream fis = new FileInputStream(filename); ObjectInputStream in = new ObjectInputStream(fis); arr = (Amount[][])in.readObject(); in.close(); } catch (Exception e) { System.out.println(e); } } public static void saveFile(Amount[][] arr, String filename){ try { FileOutputStream fos = new FileOutputStream(filename); ObjectOutputStream out = new ObjectOutputStream(fos); out.writeObject(arr); out.flush(); out.close(); } catch (IOException e) { System.out.println(e); } } </code></pre> <p>which I call like this <code>saveFile(values1, "valueOneSaveFile");</code> and <code>loadFile(values1, "valueOneSaveFile");</code></p> <p>I have run the program once, saving all the arrays to various files. The files have been created and look to be around the correct size. When I change my program to call the loadFile functions, the arrays do not appear to initialize correctly. I am getting null pointer exceptions when trying to read a value from the array (which appears to be empty after the load)</p>

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