String fileName = args[0] ;

Constructors

The constructor for BufferedReader looks like this:

BufferedReader( Reader in )

The constructor for FileReader looks like this:

FileReader( String fileName ) throws FileNotFoundException

The methods from BufferedReader which interest us are:

void close() throws IOException
    close the stream

int read() throws IOException
    read a single character into an int

String readLine() throws IOException
    read one line of characters into a String.

The read() method will be discussed later. (Both classes have other constructors and methods which will not be discussed here).