What is not possible using java class Inheritance?

1. Private members of the superclass are not inherited by the subclass and can only be indirectly accessed.
2. Members that have default accessibility in the superclass are also not inherited by subclasses in other packages, as these members are only accessible by their simple names in subclasses within the same package as the superclass.
3. Since constructors and initializer blocks are not members of a class, they are not inherited by a subclass.
4. A subclass can extend only one superclass

class Vehicle
{
    // Instance fields
    int noOfTyres; // no of tyres
    private boolean accessories; // check if accessorees present or not
    protected String brand; // Brand of the car // Static fields
    private static int counter; // No of Vehicle objects created //
    Constructor Vehicle()
    {
        System.out.println("Constructor of the Super class called");
        noOfTyres = 5;
        accessories = true; brand = "X"; counter++;
     } // Instance methods
    public void switchOn()
    {
        accessories = true;
    }
    public void switchOff()
    {
        accessories = false;
    }
    public boolean isPresent()
    {
        return accessories;
    }
    private void getBrand()
    {
        System.out.println("Vehicle Brand: " + brand);
    } // Static methods
    public static void getNoOfVehicles()
    {
        System.out.println("Number of Vehicles: " + counter);
    }
}
class Car extends Vehicle
{
    private int carNo = 10;
    public void printCarInfo()
    {
        System.out.println("Car number: " + carNo);
        System.out.println("No of Tyres: " + noOfTyres); // Inherited. //
        System.out.println("accessories: " + accessories); // Not Inherited.
        System.out.println("accessories: " + isPresent()); // Inherited. //
        System.out.println("Brand: " + getBrand()); // Not Inherited.
        System.out.println("Brand: " + brand); // Inherited. //
        System.out.println("Counter: " + counter); // Not Inherited.
        getNoOfVehicles(); // Inherited.
     }
}
public class VehicleDetails
    {
         // (3)
         public static void main(String[] args)
        {
                new Car().printCarInfo();
        }
     }

 

Output:
Constructor of the Super class called
Car number: 10
No of Tyres: 5
accessories: true
Brand: X
Number of Vehicles: 1

Posted in: J2SE, Java