Feb 26, 2010 · In BufferedWriter class that is placed in java libs, there is a one line like: private static int defaultCharBufferSize = 8192; If you do want to send data before the buffer is full, you do have control. Just Flush It. Calls to writer.flush() say, "send whatever's in the buffer, now!

1) To make sure any possible buffered bytes are written. See java.io.OutputStream.flush(). 2) Not sure what you mean, but calls to close() should be placed in a finally block to ensure the resource is closed. Quick Google reveals - article. 3) You are not reading a file object. You are reading a previously serialized Java object from a file.

Mar 2, 2011 · If I'm storing a long byte array to a FileOutputStream, I don't want Java to call the operating system file API once per byte. Thus, buffers are used at various stages, both inside and outside Java. Thus, buffers are used at various stages, both inside and outside Java.

Mar 25, 2012 · This means that it is up to the implementation's documentation (or code) to specify whether flush() is called or not. In most cases it is the norm, but there is no guaranty. Now regarding what @Fabian wrote: It is true that java.io.PrintWriter's close() method does not call flush(). However it calls out.close() (out being the underlying writer).

May 15, 2012 · You would think hasNextLine (or hasNext) could be used to check if more input is available, but this doesn't work in Java. The hasNextLine/hasNext methods always return true for the keyboard (System.in). The only way I've found to clear all buffered data without blocking is to open a new scanner: in.close(); in = new Scanner(System.in); –

Nov 16, 2009 · The downside of this is that the file is not necessarily up-to-date at any given time. Flush is a way of saying "make the file up-to-date. Close calls flush first to ensure that after closing the file has what you would expect to see in it, hence as others have pointed out, no need to flush before closing.

Feb 25, 2010 · In Java, if you are using a BufferedReader or BufferedInputStream (which I believe is a common case), "flushing" the stream can be considered to be equivalent to discarding all data currently in the buffer -- i.e., flushing the buffer.

Mar 29, 2012 · If you use close(), flush() is not necessary in your first and second example (except u wanna use flush before closing). On top of that your second example also flushes automatically when using the methods: println, printf, or format

Feb 14, 2012 · The flush method will flush all the content in the streams to the destination. After writing something, it may not be at the destination. The close method will close the streams and will do the flush before closing. The following is I got from Oracle Java I/O tutorial. To flush a stream manually, invoke its flush method.

Apr 25, 2023 · public static void clearScreen() { System.out.print("\033[H\033[2J"); System.out.flush(); } Caveats: This will work on terminals that support ANSI escape codes; It will not work on Windows' CMD; It will not work in the IDE's terminal; For further reading visit this