Java- super Keyword

super keyword in java

The super keyword in java is a reference variable that is used to refer immediate parent class object.
Whenever you create the instance of subclass, an instance of parent class is created implicitly i.e. referred by super reference variable.

Usage of java super Keyword

1. super is used to refer immediate parent class instance variable.
2. super() is used to invoke immediate parent class constructor.
3. super is used to invoke immediate parent class method.

Without super keyword...
class Vehicle{
  int speed=50;
}
class Bike3 extends Vehicle{
    int speed=100;
    void display(){
    System.out.println(speed);//will print speed of Bike
  }
  public static void main(String args[]){
    Bike3 b=new Bike3();
    b.display();
  }
}
Output : 100

With super keyword...

//example of super keyword
class Vehicle{
  int speed=50;
}
class Bike4 extends Vehicle{
  int speed=100;
   
  void display(){
   System.out.println(super.speed);//will print speed of Vehicle now
  }
  public static void main(String args[]){
   Bike4 b=new Bike4();
   b.display();
  
  }
}
Output : 50