Question

I recently started with Java and want to understand a java module of a large app. I came across this line of java code:

String line = (new BufferedReader(new InputStreamReader(System.in))).readLine();

What does this java code do. Is there a C/C++ equivalent of this?

Answer 1

System.in is the standard input.

InputStreamReader allows you to associate a stream that reads from the specified input (in this case the standard input), so now we have a stream.

BufferedReader is an “abstraction” to help you to work with streams. For example, it implements readLine instead of reading character by character until you find a ‘\n’ to get the whole line. It just returns a String after this proccess.

So this line means: “Read a line from standard input and store it in line variable”.