What is the purpose of flush in Java streams

Question

In Java  flush   method is used in streams  But I don t understand what are all the purpose of using this method   fin flush      tell me some suggestions

User · Answer

For performance issue  first data is to be written into Buffer  When buffer get full then data is written to output  File console etc    When buffer is partially filled and you want to send it to output file console  then you need to call flush   method manually in order to write partially filled buffer to output file console

User · Answer

When you write data to a stream  it is not written immediately  and it is buffered  So use flush   when you need to be sure that all your data from buffer is written   We need to be sure that all the writes are completed before we close the stream  and that is why flush   is called in file buffered writer s close     But if you have a requirement that all your writes be saved anytime before you close the stream  use flush

User · Answer

In addition to other good answers here  this explanation made things crystal clear for me   A buffer is a portion in memory that is used to store a stream of data  characters   These characters sometimes will only get sent to an output device  e g  monitor  when the buffer is full or meets a certain number of characters  This can cause your system to lag if you just have a few characters to send to an output device  The flush   method will immediately flush the contents of the buffer to the output stream   Source  https   www youtube com watch v MjK3dZTc0Lg

User · Answer

If the buffer is full  all strings that is buffered on it  they will be saved onto the disk  Buffers is used for avoiding from Big Deals  and overhead   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    reference book  https   www amazon com Head-First-Java-Kathy-Sierra dp 0596009208  pages 453

User · Answer

When we give any command  the streams of that command are stored in the memory location called buffer a temporary memory location  in our computer  When all the temporary memory location is full then we use flush    which flushes all the streams of data and executes them completely and gives a new space to new streams in buffer temporary location                          -Hope you will understand

User · Answer

Streams are often accessed by threads that periodically empty their content and  for example  display it on the screen  send it to a socket or write it to a file  This is done for performance reasons  Flushing an output stream means that you want to stop  wait for the content of the stream to be completely transferred to its destination  and then resume execution with the stream empty and the content sent

User · Answer

From the docs of the flush method      Flushes the output stream and forces any buffered output bytes to be written out  The general contract of flush is that calling it is an indication that  if any bytes previously written have been buffered by the implementation of the output stream  such bytes should immediately be written to their intended destination    The buffering is mainly done to improve the I O performance  More on this can be read from this article  Tuning Java I O Performance

[java] What is the purpose of flush() in Java streams?

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