What is this?

Question

Not use this keyword but still refer to its object, why?
https://code.sololearn.com/cnjfnHoNfNvT/?ref=app

Answer 1

Using 'this' is optional. It is still used, so it can "unhide" the properties like this:

class Animal {
String name;

Animal(String name) {
// Using "name" would just result in the argument given
this.name = name;
}