Mobile Class Hierarchy

This project demonstrates a class hierarchy for different mobile devices. It provides a base Mobile class and two subclasses, Android and BlackBerry, representing specific types of mobile devices.

Mobile

The Mobile class represents a generic mobile device. It has the following properties:

• manufacture: The manufacturer of the mobile device.
• operating_system: The operating system installed on the device.
• model: The model or name of the device.
• cost: The cost of the device.

The Mobile class provides the following functionality:

• Two constructors: one that initializes all four properties (manufacture, operating_system, model, and cost), and another constructor that initializes only manufacture and operating_system.
• The toString method is overridden to provide a formatted string representation of the mobile device, including the manufacture, operating system, model, and cost.

Android

The Android class is a subclass of Mobile and represents an Android-based mobile device. It inherits all the properties and functionality from the Mobile class.

The Android class provides the following additional functionality:

• Two constructors: one that initializes all four properties (manufacture, operating_system, model, and cost) by calling the corresponding constructor of the superclass, and another constructor that initializes only manufacture and operating_system by calling the corresponding constructor of the superclass.

BlackBerry

The BlackBerry class is another subclass of Mobile and represents a BlackBerry mobile device. It also inherits all the properties and functionality from the Mobile class.

The BlackBerry class provides the following additional functionality:

• Two constructors: one that initializes all four properties (manufacture, operating_system, model, and cost) by calling the corresponding constructor of the superclass, and another constructor that initializes only manufacture and operating_system by calling the corresponding constructor of the superclass.

Usage

To use the Mobile, Android, and BlackBerry classes, follow these steps:

1. Create instances of the respective classes using the appropriate constructors, providing the necessary arguments for the properties.
2. Use the toString method to retrieve a formatted string representation of the mobile device's information.

Example usage in the Main class:

        Mobile mobile1 = new Mobile("Nokia", "Win8", "Lumia", 10000);
        Mobile mobile2 = new Mobile("Nokia", "Win8");

        Android android1 = new Android("Samsung","Android", "Grand", 30000 );
        Android android2 = new Android("Samsung", "Android");

        BlackBerry blackBerry1 = new BlackBerry("BlackBerry", "RIM", "Curve", 20000);
        BlackBerry blackBerry2 = new BlackBerry("BlackBerry", "RIM");

        System.out.println(mobile1);
        System.out.println(mobile2);
        System.out.println(android1);
        System.out.println(android2);
        System.out.println(blackBerry1);
        System.out.println(blackBerry2);