DesignProblem2_ElevatorSystem

ElevatorSystem

Overview

The ElevatorSystem is a simulation of a basic elevator control system. This project demonstrates object-oriented design principles including inheritance, composition, aggregation, and the singleton pattern.

Class Diagram

Relationships

1. Inheritance

   • ElevatorButton and HallButton inherit from Button.

2. Composition

   • Building contains Floor objects.
   • Floor contains HallPanel and Display objects.
   • Elevator contains Door, Display, and ElevatorPanel objects.

3. Aggregation

   • Building aggregates Elevator objects.
   • ElevatorPanel aggregates ElevatorButton objects.

4. Singleton Pattern

   • Building and ElevatorSystem use the singleton pattern to ensure only one instance exists.

How It Works

The system consists of several interconnected classes that simulate the behavior of an elevator system in a building:

• Building: Singleton class that manages multiple floors and elevators.
• Floor: Represents a floor in the building, containing hall panels and displays.
• HallPanel: Contains up and down buttons to call the elevator.
• Elevator: Manages the state and behavior of an individual elevator, including doors, displays, and buttons.
• ElevatorPanel: Contains buttons inside the elevator to select destination floors and open/close doors.
• Display: Shows the current floor and direction of the elevator.
• Button: Abstract base class for all buttons in the system.
• ElevatorButton: Button inside the elevator for selecting floors.
• HallButton: Button on the floor to call the elevator in a specific direction.
• ElevatorSystem: Singleton class that monitors and controls the elevator system.

Sample Output

Here is a sample output demonstrating how the system operates:

Monitoring the elevator system...
Elevator 0 moving from floor 0 to floor 5.
Door is now Open.
Door is now Closed.
Elevator 1 moving from floor 0 to floor 9.
Door is now Open.
Door is now Closed.
Hall button for direction UP pressed.
Elevator button for floor 5 pressed.
Elevator 0 moving from floor 0 to floor 5.
Door is now Open.
Door is now Closed.
Hall button for direction Down pressed.
Elevator button for floor 0 pressed.
Elevator 1 moving from floor 9 to floor 0.
Door is now Open.
Door is now Closed.