private void mergeFiles() throws FileNotFoundException {
		try (OutputStream outStream = new FileOutputStream(
				"monthlyDataFile.txt");
				SequenceInputStream inputStream = new SequenceInputStream(
						fileStreams.elements());) {
			byte[] buffer = new byte[4096];
			int numberRead = 0;
			while ((numberRead = inputStream.read(buffer)) != -1) {
				outStream.write(buffer, 0, numberRead);
			}
		} catch (IOException e) {
			System.out.println("Error reading/writing file");
		}
		System.out.println("Created monthlyDataFile.csv "
				+ "in your current folder");
	}