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copied!<pre><code>// from your main method String fname = "data.txt"; readData (fname); // the method being called public static void readData (String data[][]){ BufferedReader br = new BufferedReader(new FileReader(data)); </code></pre> <p>We have an incompatibility here.</p> <ul> <li>fname is a String</li> <li>The method takes a String[] as a parameter. </li> <li>the constructor newFileReader() takes a string, not 2d array.</li> </ul> <p>All of these three should be the same data type. </p> <blockquote> <p>How can I separate each "receipt" with zero (like shown in the image link above)?</p> </blockquote> <p>You don't have to. You have to READ from that file with the zeros in it.<br> I would recommend you write a method something like this:</p> <p>public double[] readOneReceipt(BufferedReader reader);</p> <p>This method should</p> <ul> <li>Read line by line until it encounters a 0 entry</li> <li>for each entry it reads convert the value into a number (double?) </li> <li>Store the number in a temporary structure. </li> <li>When you encounter the "0", create a new array of the correct size and copy the read values into it.</li> </ul> <blockquote> <p>How can I write the output into a separate file? </p> </blockquote> <p>With a java.io.FileWriter</p> <p>The hardest bit of this IMO is the fact that you are told to store the data in a 2d array, but you don't exactly what size to make the array until you've read the data. Which means that you either use a temporary dynamic structure, or read the file twice - once to find out how many receipts there are so that you can make the array, and then again to actually read the receipt data.</p>

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