The readData method of the DataSetReader class

• Reads the number of values
• Constructs an array
• Calls readValue for each data value

  private void readData(Scanner in) throws BadDataException
  {
     if (!in.hasNextInt())
        throw new BadDataException("Length expected");
     int numberOfValues = in.nextInt();
     data = new double[numberOfValues];
  
     for (int i = 0; i < numberOfValues; i++)
        readValue(in, i);
  
     if (in.hasNext())
        throw new BadDataException("End of file expected");
  }

• Checks for two potential errors
  1. File might not start with an integer
  2. File might have additional data after reading all values
• Makes no attempt to catch any exceptions