I'm reading about Buffer Streams. I searched about it and found many answers that clear my concepts but still have little more questions.
After searching, I have come to know that, Buffer is temporary memory(RAM) which helps program to read data quickly instead hard disk. and when Buffers empty then native input API is called
.
After reading little more I got answer from here that is.
Reading data from disk byte-by-byte is very inefficient. One way to speed it up is to use a buffer: instead of reading one byte at a time, you read a few thousand bytes at once, and put them in a buffer, in memory. Then you can look at the bytes in the buffer one by one.
I have two confusion,
1: How/Who data filled in Buffers? (native API how?) as quote above, who filled thousand bytes at once? and it will consume same time. Suppose I have 5MB data, and 5MB loaded once in Buffer in 5 Seconds. and then program use this data from buffer in 5 seconds. Total 10 seconds. But if I skip buffering, then program get direct data from hard disk in 1MB/2sec same as 10Sec total. Please clear my this confusion.
2: The second one how this line works
BufferedReader inputStream = new BufferedReader(new FileReader("xanadu.txt"));
As I'm thinking FileReader write data to buffer, then BufferedReader read data from buffer memory? Also explain this.
Thanks.