<h2 id="heading-concrete-subclass">Concrete Subclass :</h2>
<ul>
<li>The concept of a concrete class is inherent in object-oriented programming and is not confined to Dart or Flutter.
</li>
<li>A concrete class is a standard class where each method carries its specific implementation. No method in a concrete class should lack an implementation.
</li>
<li>Understanding this is crucial in Dart programming, especially when working with abstract and concrete classes.
</li>
<li>Remember, unlike an abstract class, a concrete class must not contain any abstract methods as defined by the abstract keyword.
 ```dart
 abstract class Shape {
 void draw();
</li>
</ul>
 void display() {
 print('Displaying shape...');
 }
 }
 class Circle extends Shape {
 <a href="https://hashnode.com/@override" class="user-mention" target="_blank" rel="noopener">@override</a>
 void draw() {
 print('Drawing circle...');
 }
 }
 class Square extends Shape {
 <a href="https://hashnode.com/@override" class="user-mention" target="_blank" rel="noopener">@override</a>
 void draw() {
 print('Drawing square...');
 }
 }
 void main() {
 Circle circle = Circle();
 Square square = Square();
 circle.draw();
 circle.display(); 
 square.draw(); 
 square.display(); 
 }
<pre><code>
* ```dart
 Drawing circle...
 Displaying shape...
 Drawing square...
 Displaying shape...

 Exited.
</code></pre>

## Concrete Subclass :

* The concept of a **concrete class** is inherent in object-oriented programming and is not confined to Dart or Flutter.
    
* A concrete class is a standard class where each method carries its specific implementation. No method in a concrete class should lack an implementation.
    
* Understanding this is crucial in Dart programming, especially when working with *abstract* and *concrete classes*.
    
* Remember, unlike an abstract class, a concrete class must not contain any abstract methods as defined by the abstract keyword.
    
    ```dart
    
    abstract class Shape {
    
      void draw();
    
    
      void display() {
        print('Displaying shape...');
      }
    }
    
    
    class Circle extends Shape {
      @override
      void draw() {
        print('Drawing circle...');
      }
    }
    
    
    class Square extends Shape {
      @override
      void draw() {
        print('Drawing square...');
      }
    }
    
    void main() {
    
      Circle circle = Circle();
      Square square = Square();
    
      circle.draw();
      circle.display(); 
    
      square.draw(); 
      square.display(); 
    }
    ```
    
* ```dart
    Drawing circle...
    Displaying shape...
    Drawing square...
    Displaying shape...
    
    Exited.
    ```

Dart Abstract Class : Concrete Subclass

Concrete Subclass :