How do I create and use classes and objects in Dart?
How do I create and use classes and objects in Dart?
In Dart, creating and using classes and objects follows a similar structure to other object-oriented languages. Here’s a basic overview:
A class is a blueprint for creating objects. It defines properties (variables) and methods (functions) that the objects created from the class will have.
Here’s an example of a simple class:
Person(this.name, this.age);
print('Name: $name, Age: $age');
name and age are properties (also called fields or attributes).
The constructor Person(this.name, this.age) initializes the properties when the object is created.
displayInfo is a method that displays the person's name and age.
Once you’ve defined a class, you can create objects from it. Objects are instances of the class and have access to the class’s properties and methods.
Person person1 = Person('John Doe', 25);
3. Private Properties and Methods
In Dart, you can make properties and methods private by prefixing them with an underscore (_).
Getters and setters allow controlled access to class properties. Dart supports automatic getters and setters, but you can also define them explicitly.
Rectangle(this._width, this._height);
double get area => _width * _height;
set width(double value) {
set height(double value) {
In Dart, a class can inherit properties and methods from another class using the extends keyword.
print('Animal makes a sound');
class Dog extends Animal {
dog.makeSound(); // Output: Dog barks
6. Abstract Classes and Interfaces
An abstract class is a class that cannot be instantiated. You use it as a base class that other classes inherit from. It can contain abstract methods (methods without implementation).
class Circle extends Shape {
double getArea() => 3.14 * radius * radius;
Circle circle = Circle(5);
print(circle.getArea()); // Output: 78.5
Class: A blueprint for creating objects.
Object: An instance of a class.
Constructor: A special method to initialize objects.
Methods: Functions inside a class.
Getters and Setters: Control how you access and set property values.
Inheritance: Reusing and extending functionality from another class.
Abstract Classes: Classes with unimplemented methods, serving as a template for subclasses.
You can use these building blocks to create more complex applications in Dart.
Hire Me: https://www.fiverr.com/s/Gzyjzoz
Facebook Profile: https://www.facebook.com/iamsusmoydutta
Medium Profile :https://medium.com/@softcode9x/how-do-i-create-and-use-classes-and-objects-in-dart-2b2a2e39d422
Behance Profile: https://www.behance.net/susmoydutta
Linkedin Profile: https://www.linkedin.com/in/susmoy-dutta/