what is difference between using BufferedInputStream and File InputStream for java input? when is it prefered to use the Buffered?

Answer 1

- BufferedInputStream is buffered, but FileInputStream is not.

- A BufferedInputStream reads from another InputStream, but a FileInputStream reads from a file.

Answer 2

how i can determine which type of input or output to use?
there are a lot of classes!! i need an useful article about the summary.