Read all lines with BufferedReader

Question

I want to type a multiple line text into the console using a BufferedReader and when I hit \"Enter\" to find the sum of the length of the whole text. The problem is that it

Answer 1

line will not be null when you press enter; it will be an empty string.

Take note of what the BufferedReader JavaDoc says about readLine():

Reads a line of text. A line is considered to be terminated by any one of a line feed ('\n'), a carriage return ('\r'), or a carriage return followed immediately by a linefeed.

And readLine() returns:

A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached

So when you press [Enter], you are giving the BufferedReader a new line containing only \n, \r, or \r\n. This means that readLine() will return an empty string.

So try something like this instead:

InputStreamReader instream = new InputStreamReader(System.in);
BufferedReader buffer = new BufferedReader(instream);

line = buffer.readLine();

while( (line != null) && (!line.isEmpty()) ){
    length = length + line.length();
    line = buffer.readLine();
}