Java NIO：为什么方法名称“读取”“写入”听起来相反？

Question

I am new to Java NIO and I am not an English native speaker.

When I read the method call about reading and writing buffer, I always get confused. It sounds the opposite to me.

For example,

fileChannel.read(buffer)

According to FileChannel javadoc, it means

Reads a sequence of bytes from this channel into the given buffers

I wonder why it does not call "write" instead.

In English, "write into" and "read from" sounds a more natural pairs than "write from" and "read into". Also in code reading too

fileChannel.write(buffer)

FileChannel writes a sequence of bytes into the given buffers

This clearly states what the actor is going to do.

Now I need to read everything opposite in order to get thing right...

Maybe they call them like that because of historical reason how they call them in IO package? Or maybe I am missing something obvious? Hope I could have your advice how to interpret them correctly.

Thanks!

Answer 1

当您拥有object.verb(…) ，动词通常是在对象上执行的，因此，如果您想读取fileChannel ，则应具有fileChannel.read(…) 。

Answer 2

In any data transfer, there's always a source from which data is read , and a destination to which the data is written . Perhaps because files are rather more permanent than memory buffer contents, it's just always been the convention to name transfer operations involving a file and a memory buffer with respect to the role of the file rather than that of the buffer. So when the file is the source and the buffer the destination, it's a "read" and when the file is the destination and the buffer the source, it's a "write".