2. void file_open () {
3.   String line = "test";
     BufferedReader node_reader;
     node_reader = createReader("nodedata.txt");
4.   while (line !=null ) {  
5.     try {
6.           line = node_reader.readLine();
7.           if ( line != null ) {
               String[] pieces = split(line, TAB);
               int a = int(pieces[0]);
               int b = int(pieces[1]);
               int c = int(pieces[2]);
               int d = int(pieces[3]);
               int e = int(pieces[4]);
      
      
               listofNodes.add(new Node(a, b, e));  //
              }
    
         } catch (IOException e) {
         e.printStackTrace();
         line = null;
       }
     }
   }