BufferedOutputStream的目的是什么？ [英] what's the purpose of BufferedOutputStream?

问题描述

我想知道BufferedOutputStream的用途，使用它时的性能提升？

I am wondering the purpose of BufferedOutputStream, performance gain when using it?

推荐答案

以下是来自 BufferedOutputStream的API ：

该类实现缓冲输出流。通过设置这样的输出流，应用程序可以将字节写入基础输出流，而必然会为每个写入的字节调用底层系统。

The class implements a buffered output stream. By setting up such an output stream, an application can write bytes to the underlying output stream without necessarily causing a call to the underlying system for each byte written.

它可以在缓冲区内完成大部分操作，而无需调用底层系统。

It can do most of operations within the buffer, and without a call to the underlying system.

例如，考虑写入文件：没有缓冲区，它必须为每个字节进行系统调用，这显然很慢。

For example, consider writing to file: without buffer, it has to make a system call for every single byte, which is obviously slow.

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