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Super keyword in Dart Programming
Super keyword in dart is used to refer to the parent's class object's methods or variables. In simple terms, it is used to refer to the superclass properties and methods.
The most important use of the super keyword is to remove the ambiguity between superclass and subclass that have methods and variables with the same name.
The super keyword is able to invoke the parent's objects method and fields, as when we create an instance of the subclass in Dart, an instance of the parent class is also created implicitly.
Syntax
super.varName or super.methodName
As we can access both the variables and methods of the parent's class.
Accessing parent class variable
We can access the parent class variable which is also declared in the subclass.
Example
Consider the example shown below −
class Animal {
int count = 30;
}
class Dog extends Animal {
int count = 70;
void printNumber(){
print(super.count);
}
}
void main(){
Dog obj= new Dog();
obj.printNumber();
}In the above example, we have two classes Animal and Dog, where Animal is the parent class (or Superclass) and the Dog is the child class (or subclass). It should be noted that the variable named count is declared in both the superclass and the subclass, and when we use super.count it will refer to the parent-class (superclass).
Output
30
Accessing parent class methods
We can also access the parent class methods that might also be declared in the subclass.
Example
Consider the example shown below −
class Animal {
void tellClassName(){
print("Inside Animal Class");
}
}
class Dog extends Animal {
int count = 100;
void tellClassName(){
print("Inside Dog Class");
}
void printMessage(){
tellClassName();
super.tellClassName();
}
}
void main(){
Dog obj= new Dog();
obj.printMessage();
}Output
Inside Dog Class Inside Animal Class
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