What does flush mean in java

flush() method is used to force the data in the buffer to be written to the underlying target. Can be used for OutputStream, Writer and Flushable objects, the usage is as follows: OutputStream: outputStream.flush()Writer: writer.flush()Flushable: flushable.flush()

#The meaning of flush() method in Java

#flush() method is a method used to force the data in the buffer to be written to the underlying target, usually used for stream objects middle.

How to use flush() method?

The flush() method is available on the following stream objects:

• java.io.OutputStream
• java.io.Writer
• java.io.Flushable

The usage method is very simple, just call the flush() method on the stream object, as shown below:

OutputStream outputStream = ...;
outputStream.flush();

Writer writer = ...;
writer.flush();

Flushable flushable = ...;
flushable.flush();

flush() method Effect

flush() method will force all data in the buffer to be written to the underlying destination, even if the buffer is not full. This is useful when:

• Ensuring data is written immediately: When you need to ensure data is written immediately to the underlying destination, such as in file writing or network communication.
• Prevent buffer overflow: When the buffer is full, calling the flush() method can prevent data overflow and ensure that data is not lost.
• Forcing output: In some stream objects, the flush() method can force the output to be flushed immediately, even if the underlying target is not ready to receive it.

The difference between the close() method

The flush() method is different from the close() method. The close() method will close the stream and release all systems resource, and the flush() method will only force the data in the buffer to be written and will not close the stream.

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