Using BufferedWriter to write to a string
bufferedwriter, java, stringwriter
Solution
You need to call "flush()" to flush the contents of the buffer to the output: http://docs.oracle.com/javase/7/docs/api/java/io/BufferedWriter.html#flush()
Though I should add that rather than select between BufferedWriter objects, you probably want to simply select between Writer objects... the StringWriter has a buffer of its own, so there is no need to add an extra layer of a BufferedWriter on top of it.
Problem
I am trying to use a `BufferedWriter` to switch between writing to a `File` and writing to a `String`, but I have never used a `BufferedWriter` to write to anything but a file. Take this compilable code: ``` public static void main(String[] args) { try (BufferedWriter fileWriter = new BufferedWriter(new FileWriter(new File("file.txt"))); StringWriter sw = new StringWriter(); BufferedWriter stringWriter = new BufferedWriter(sw)) { LinkedList<Record> records = new LinkedList<>(); records.add(new Record("name1", "text1", 20.4)); records.add(new Record("name2", "text2", -78)); records.add(new Record("name3", "text3", 11.56)); records.add(new Record("name4", "text4", 56)); records.add(new Record("name3", "text3", -44)); for(Record record : records) { BufferedWriter writer; if(record.amount < 0) { writer = stringWriter; // write to string if amount is less than zero } else { writer = fileWriter; // write to file if not } writer.append(record.name); writer.append(","); writer.append(record.text); writer.append(","); writer.append(String.valueOf(record.amount)); writer.newLine(); } String less_than_zero_amounts = sw.toString(); System.out.println("Less than zero:" + less_than_zero_amounts); } catch (IOException e) { e.printStackTrace(); } } static class Record { String name; String text; double amount; public Record(String name, String text, double amount) { this.name = name; this.text = text; this.amount = amount; } public String getText() { return text; } public String getName() { return name; } public double getAmount() { return amount; } } ``` The output for the file is (correctly) ``` name1,text1,20.4 name3,text3,11.56 name4,text4,56.0 ``` But the output for the program does not print the `StringWriter`. Admittedly, using a `StringWriter` and giving that to the `BufferedWriter` was a hunch. Any way I can switch a `BufferedWriter` to output to a `String` would solve the problem.