title: Java - Trouble creating a 2D array from a text file
body: <p>I have a text file that is formatted as a square array.  I am trying to convert this to a 2 dimensional array in Java.  "st" is the text file described below.</p>
  
  <p>This is my code:</p>
  
  <pre><code>public createArray(String st) throws NumberFormatException, IOException {
  
  InputStream is;
  
  is = new FileInputStream(st);
  
  BufferedReader br = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
      int row = 0;
  
      while ((line = br.readLine()) != null){
          String[] nums = line.split(" ");
  
          for (int col = 0; col &lt; nums.length; col++){
  
              int n = Integer.parseInt(nums[col]);
  
              myArray[row][col] = n;
          }
          row++;
  
      }
  </code></pre>
  
  <p>I am getting a null pointer exception on the line:</p>
  
  <pre><code>myArray[row][col] = n;
  </code></pre>
  
  <p>If I print out the values of row, col, and n at each iteration, they appear to coincide correctly. However, I am still getting a NullPointerException.</p>
  
  <p>The text file is formatted as:</p>
  
  <pre><code>1 2 3 4 5 6 7 8 9 10
  11 12 13 14 15 16 17 18 19 20
  21 22 23 24 25 26 27 28 29 30
  31 32 33 34 35 36 37 38 39 40
  41 42 43 44 45 46 47 48 49 50
  51 52 53 54 55 56 57 58 59 60
  61 62 63 64 65 66 67 68 69 70
  71 72 73 74 75 76 77 78 79 80
  81 82 83 84 85 86 87 88 89 90
  91 92 93 94 95 96 97 98 99 0
  </code></pre>