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copied!<p>The problem comes in your <code>All_user</code> class constructor; you're trying to set... something... of type <code>Ratings[]</code> to a class member of type <code>double[]</code></p> <p>You could do one of the following :</p> <p>1- Have your <code>All_user</code>'s constructor receive an array (or variable-length arguments) be instances of <code>Rating</code> and simply assign it to the class member (an array) of the same type :</p> <pre><code>public class All_user{ Rating [] All_users; public All_user(Rating...argument) { All_users = argument; // arguments is a Rating[] } } </code></pre> <p>or collect all values (<code>double Ratings</code>) from each <code>Rating</code> and map them into an array</p> <pre><code>public class All_user{ double [] All_users; public All_user(Rating...argument) { ArrayList<Double> ratings = new ArrayList<Double>(); for (Rating r : argument) { for (double d : r.Ratings) ratings.add(d); } All_users = new double[ratings.size()]; for (int i=0; i<ratings.size(); i++) All_users[i] = ratings.get(i); } } </code></pre> <p>I think the latter is what you are trying to do. Also, note that your <code>Rating</code> class could also be rewritten as </p> <pre><code>public class Rating{ double [] Ratings; int CustomerID; int Domain; public Rating (int id, int d, double...x) { double [] Ratings = x; int CustomerID=id; int Domain=d; } } </code></pre> <p>FYI: The variable-length argument is always the last one in the declared arguments. More on varargs <a href="http://download.oracle.com/javase/1.5.0/docs/guide/language/varargs.html" rel="nofollow noreferrer">here</a> and <a href="https://stackoverflow.com/questions/766559/when-do-you-use-varargs-in-java">here</a>.</p>

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