What is system.in

Question

Consider this Scanner input example.

Scanner user_input = new Scanner( System.in );

Here Scanner is the CLASS.

Answer 1

Scanner class accepts input stream as a parameter and System class have a static variable in which is of type InputStream. System.in gives you a instance of of type InputStream.

Check this doc of public static final InputStream in

The "standard" input stream. This stream is already open and ready to supply input data.