What does flush mean in java

flush in Java instructs buffer data to be forced to be written to a storage device or network to ensure persistence, prevent loss, and improve performance. It is performed by calling OutputStreamWriter.flush() and is recommended when writing important data, requiring immediate access to data, using large buffers, or when high performance is required.

flush in Java

meaning of flush

in In Java, flush refers to forcing the data in the buffer to be written to the underlying storage device or network. It ensures that data does not remain in the buffer but is written to the target immediately.

Function

flush is very useful in the following situations:

• Ensure that data is persisted to prevent accidental loss.
• Prevent buffer overflow, causing the program to hang.
• Improve application performance and reduce write latency.

Usage

To perform a flush operation, you can use the following code:

<code class="java">OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream("output.txt"));
outputStreamWriter.flush();</code>

This code will force to be written outputStreamWriter writes all data in the buffer to file output.txt.

When to use

Here are some situations where flush is recommended:

• Writing important data, such as financial records or customer information .
• The data needs to be accessed immediately after the write operation.
• To prevent buffer overflow when using a larger data buffer.
• When the application requires high performance and low latency.

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