A simple elevator control system implemented in java.
Below classes are developed :
- Elevator
- Passenger (Can control, number of passengers, their weights etc..)
- Interface
- Implementation of Interface
- Main class to run the code
- Testcases
- The system asks how many elevators and how many floors the system covers.
- Initializes the Elevator Control System.
- Each elevator will be at floor 0 initially. (i have used 0 based index. Hence, range will be 0 to MAX_FLOORS-1)
- It can be assumed that whenever an elevator halts at a certain floor, the doors will be kept open.
- An user can stand in the lobby of certain floor and can request a pickup by pressing either UP or DOWN from the lobby.
- For bottom most floor and top most floor there should be only one direction.
- The user can update the elevator (after entering in to it) by calling the update method. update method needs only two parameters, elevator id and the destination floor.
- step function should simulate the entire ecosystem and keep moving the elevator system. If there is no traffic, system should by idle.
- I have used a integer array to represent the configuration of elevators and floors in a bottom up fashion.
- 0 -> Default value.
- 1 -> Elevator is here.
- 9 -> This is in elevator goal floors list
- I have used zero based index.
- The program initially requires two values :
- Number of elevators and
- Number of floors.
- Then, the program accepts tow commands :
- pick
- This needs two arguments : floorNumber and direction.
- update
- This needs tow arguments as well : elevatorId and destination floor.
- pick
- Due to time constraints of 4 hour period, the code may be a bit redundant, but I have optimized for complexity & functionality.
- Also, I am not checking for basic input validation and always assuming that the inputs are valid.
- E.g: If you enter pickup floor as 20 in a 15 floor system, system will crash. This behavior can be changed with very minimal code change.
$ javac -cp . SimpleElevatorSystem.java Test.java
$ java Test
$ java SimpleElevatorSystem
========================================
Available commands : [pick] or [update]
pick needs a floor number and direction
update needs elevatorId and goalFloor
========================================
Enter number of elevators :
4
Enter number of floors :
4
[0, 0, 0, 0]
[0, 0, 0, 0]
[0, 0, 0, 0]
[1, 1, 1, 1]
Input command [Enter to step]:
pick
3
-1
[0, 0, 0, 0]
[0, 0, 0, 0]
[0, 0, 0, 0]
[1, 1, 1, 1]
Input command [Enter to step]:
[0, 0, 0, 0]
[0, 0, 0, 0]
[1, 1, 1, 1]
[0, 0, 0, 0]
Input command [Enter to step]:
[0, 0, 0, 0]
[1, 1, 1, 1]
[0, 0, 0, 0]
[0, 0, 0, 0]
Input command [Enter to step]:
[1, 1, 1, 1]
[0, 0, 0, 0]
[0, 0, 0, 0]
[0, 0, 0, 0]
Input command [Enter to step]:
update
3
0
[1, 1, 1, 1]
[0, 0, 0, 0]
[0, 0, 0, 0]
[0, 0, 0, 9]
Input command [Enter to step]:
[1, 1, 1, 1]
[0, 0, 0, 0]
[0, 0, 0, 0]
[0, 0, 0, 9]
Input command [Enter to step]:
[1, 1, 1, 0]
[0, 0, 0, 1]
[0, 0, 0, 0]
[0, 0, 0, 9]
Input command [Enter to step]:
[1, 1, 1, 0]
[0, 0, 0, 0]
[0, 0, 0, 1]
[0, 0, 0, 9]
Input command [Enter to step]:
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