Question

How do you call the superclass constructor from its subclass?

Answer 1

How do you call the superclass constructor from its subclass?

ans) Using super keyword, we can call the super class constructor from its subclass.

Example:

Rect.java file:

public class Rect {
   double width ;
   double length ;
   Rect(double width, double length){
       this.width = width ;
       this.length = length ;
   }
   public double area() {
       return this.width * this.length ;
   }
}

Square.java file:

public class Square extends Rect{
   public Square(double side) {
       super(side, side);
   }
}