BufferedReader empty

[Peter]

I want to know if really the sentence "BufferedReader" saves the information in buffer because when I execute the following sentences the BufferedReader is empty
why does it happen?

br = new BufferedReader(new FileReader(file)); 

FileWriter fw = new FileWriter(file); 

while ((str = br.readLine())!= null)

thanks,
peter

[Heather]

Create a BufferedReader doesn't save in memory the information in buffer.
BufferedReader improves the performance of the reader, avoid access to the disk when you are reading.

[Ed]

heather is right
I give you some link and then you read it to inform you
BufferedReader