A method to write into file, append data to new line each time separated by comma in java

WriteToFile.java

class WriteToFile{
BufferedWriter bw;
	public void writeFile1(String number){
		File fout = new File(Environment.getExternalStorageDirectory() + "/numbers0300.cvs");
		FileOutputStream fos = null;
		try {
			fos = new FileOutputStream(fout);
			bw = new BufferedWriter(new OutputStreamWriter(fos));
			bw.write(number + ",");
			Log.i(TAG, "writeFile1: " + number);
			bw.newLine();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}
}