在无限循环中使用BufferedWriter

Question

Is it possible for me to use a BufferedWriter (or any writer class for that matter) to output a new line to a text file during each iteration of an infinite loop until the program is stopped? To my understanding, the BufferedWriter.close() command must be called for the text to be saved onto the file, but if the writer is closed within the loop, the program will throw an exception - obviously, if the writer is set to close outside the loop, the statement is unreachable. Thanks in advance for any help.

Here's the relevant code:

             int count = 0;
             BufferedWriter out = new BufferedWriter(new FileWriter("myTextFile.txt"));
             while (true) 
             {

                if(count == 0){
                    out.write(myString);
                    out.newLine();
                    System.out.println(myString);
                } else {
                    out.append(myString);
                    out.newLine();
                    System.out.println(myString);

                }
                System.out.println("count = " + count);
                count++;
                out.flush();
                out.close();                   
             }

Answer 1

If you just want to make sure all data is written to file, flush will do it. Close is mostly to release the resource, especially if you are calling flush explicitly

flush - Flushes the stream.

close - Closes the stream, flushing it first. Once the stream has been closed, further write() or flush() invocations will cause an IOException to be thrown. Closing a previously closed stream has no effect.

More info: http://docs.oracle.com/javase/8/docs/api/java/io/BufferedWriter.html

Answer 2

You should use Flush method and extract your close in the finalize() method.

Using Flush will allow you to see the result in your text file while your app write in it.

When you stop your application, the GC will call finalize method and close the stream.