Before we begin, please follow conventions.
This is wrong:

Classes have to be upper-cased, like this:

Car toyota = new Car(...);

maybe rename your classes and files to reflect this :)

1. The easiest way is to use input

read this

2. Yes

A method would be great, define a method on the class Car, like this:

String printData() {
  System.out.println("its max speed is: " + getSpeed());
  ...
}