Using super keyword with constructor

We can use the super keyword to access the parent class constructor. The super keyword can call both parameterized and non-parameterized constructors depending on the situation. The syntax is given below.

Syntax:

:super(); 

Example –

1. // Base class called Parent  
2. class Parent  
3. {   
4.     Parent()   
5.     {   
6.         print(“This is the super class constructor”);   
7.     }   
8. }   
9.   
10. // Child class Super  
11. class Child extends Parent   
12. {              
13.     Child():super()   // Calling super class constructor  
14.     {                   
15.         print(“This is the sub class constructor”);   
16.     }   
17. }  
18.   
19. void main() {  
20.  // Creating object of sub class  
21. Child c = new Child();   
22. }  

Output

This is the super class constructor
This is the sub class constructor

Explanation
The syntax of Dart language is too close to C# language We called the parent class constructor using the super keyword, which is separated by : (colon). The delegate a superclass constructor, we should put the superclass as an initializer.