In this example, the prepareByteArray method processes the Certificate object before passing it to the SuperClass constructor. With JEP 447, this process becomes more streamlined and intuitive.

The example I get is the Math class. Programmers should have access to Math.sqrt(), Math.random() and other methods, ... Constructors (in java), have no ability to do this.

This tutorial on how to use the Java Scanner for user input will quickly show you how to import java.util, take String, ... Specify the System.in as the argument for the Scanner’s constructor.