Question

What is the significance of using protected declaration during inheritance? Show with the help of an example. 

Answer 1

1. When data members of a base class are protected, relative courses can access them.
2. Therefore, giving them to the derived class using the input functions is unnecessary.
3. Example:

   public class Shape
   {
   protected double height;
   protected double width;
   
   public void setValues(double height, double width)
   { this.height = height;
   this.width = width;
   }
   } // end of class Shape
   
   public class Rectangle extends Shape
   {
   
   public double getArea() 
   {
   return height * width;
   // the child class is able to access the protected members of the parent class as shown
   above.
   }
   }