The class abstract class static extends overrides the object operator, mainly.. Cascade operation
* The three basic characteristics of object-oriented programming oop encapsulation inheritance polymorphism
* Everything in Dart is an object, and all objects inherit from Object
* Object-oriented language using classes and single inheritance All objects are instances of classes and all classes are subclasses of Object
Object-oriented Three major characteristics Encapsulation, inheritance Polymorphism
* Dart uses extends to inherit properties and methods, and does not inherit constructors, getter setters, and override methods