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difference between fileReader and bufferReader
hi all
I try to understand what is the difference between fileReader and buffered reader i know that fileReader get hard disk and that makes the program slow but i can't figure it out so what bufferedReader do in order to make it fast???
thanks
shadi
Related threads:
Re: difference between fileReader and bufferReader
I only know what I read in the API doc. Have you read it?
For example:Without buffering, each invocation of read() or readLine() could cause bytes to be read from the file, converted into characters, and then returned, which can be very inefficient.
Re: difference between fileReader and bufferReader
A file reader can only read files. A buffered reader can read from pretty much any type of stream it can create a buffer for.
Re: difference between fileReader and bufferReader
I want to know about its affection on speedA file reader can only read files. A buffered reader can read from pretty much any type of stream it can create a buffer for.
I want to know what happened in hardware when you use bufferedReader(/Writer)I only know what I read in the API doc. Have you read it?
For example:
Quote:
Without buffering, each invocation of read() or readLine() could cause bytes to be read from the file, converted into characters, and then returned, which can be very inefficient.
Re: difference between fileReader and bufferReader
A buffered reader will pre-emptively read in the stream and store it into a buffer in the memory (hence the name: buffered reader). A file reader will only read from the hard disk each time it's asked to, and only how much it's asked to (I think, there's likely a second alternative where the OS opens the file and stores it into a buffer, but the file reader must use JNI to access this data).
shadihrr (June 8th, 2010)
Re: difference between fileReader and bufferReader
As far as I'm aware I think you can pass a FileReader to a BufferedReader. The BufferedReader is just a wrapper reader with a more helpful interface to it then the other readers. At the end of the day the FileReader will just open an inputstream anyways which the BufferedReader will read.
As long as you read from the filesystem you will always have some speed issues no matter if you use the buffered reader or the filereader, I dont think there is much difference in speed though.
If you want speed, you need to load things into memory and do it that way
// Json
shadihrr (June 8th, 2010)
Re: difference between fileReader and bufferReader
thanks to all your answer they were helpful!!
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