Defining Classes and Understanding Objects
Explore how to define classes and create objects in Dart to build reusable and scalable code. Understand properties, methods, and how to instantiate multiple objects with independent states, forming the foundation for object-oriented programming.
A blueprint is a guide used for making something. In the real world, blueprints are plans for buildings. We can create multiple buildings using the same blueprint. Each building is unique but shares the same basic architecture. A blueprint might specify the number of rooms. One house built from it might have white walls, and another might have blue walls. They are unique entities related through a shared structure.
Classes act as blueprints we use to create objects. An object is an instance of a class. That instance is the actual entity we use in our programs. Just like a single house is a physical instance of a paper blueprint, an object is the concrete realization of a class in memory.
The class defines the properties an object will have and the operations it can perform. Together, properties and methods are known as the members of a class. In Dart, properties are called instance variables. These variables hold the specific state of an object once it is created.
Built-in and user-defined classes
Classes in Dart fall into two broad categories: built-in classes and user-defined classes. When we define a list, we are creating an instance of ...