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输入流、输出流

判断当前流是输入流还是输出流的依据是二进制数据相对于计算机内存的位置,输入流是输入计算机内存是二进制数据,输出流是从计算机内存输出的二进制数据。而计算机程序在运行期间会储存在到计算机内存中,因此总的来说就是数据的来源、取向是相对程序而言的。比如键盘键入数据属于输入流,内存数据持久化到磁盘中属于输出流。

说明:本图片取自互联网,纠正补充为流的来源有网络连接、内存块、磁盘(文件)、键盘等;流的去向也基本是这些。

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