Task 1: Docking We would like to define a universal interface for our equipment and drones for docking. This way, when we develop new vehicles or stations we can implement the universal interface and know that it will behave in the same way. Instructions Create a Java interface called Dockable which has the following methods specified: a method called canDock that takes no parameters and returns a boolean a method called dock that takes a Drone as a parameter and returns an integer Task 2: Drones and Stations Now we want to test our docking interface, but first we want to define an abstract class for our drones from which we will model all of our designs after. Instructions Create an abstract class called Drone that has the following properties: a private attribute called name of type String a private attribute called weight of type double appropriate getters/setters for the attributes an abstract method called printInfo an abstract method called calculateTotalWeight that returns a double Create a subclass of Drone called AerialDockingStation that uses the Dockable interface Make sure that the AerialDockingStation class has the following properties: a private array of Drone objects that represents the docked drones The index of each object represents its docking number/bay Implement all of the necessary methods in AerialDockingStation canDock returns true if there is space for a drone to dock or false if the docking array is full dock must take a Drone as a parameter and add it to the array of docked drones: if the drone is added to the array, return the index of the drone if the drone cannot be added to the array return -1 calculateTotalWeight must return the weight of the AerialDockingStation that includes the weight of the docked drones if the AerialDockingStation weighs 2000 kg and it has one drone docked that weighs 400 kg then calculateTotalWeight should return 2400 printInfo must print out the name of the AerialDockingStation and a list of the docked drones (see sample output) if no drones are docked then it should print none Create a subclass of Drone called DeliveryDrone that implements the abstract methods of the Drone class: printInfo should print out the name and weight of the DeliveryDrone calculateTotalWeight should just return the weight of the DeliveryDrone Hint: the docking array may be partially filled. Sample Input/Output The following demo code produces the sample output: publicclass AssignmentDemo {publicstaticvoidmain(String[] args){ AerialDockingStation ads =newAerialDockingStation("ADS",4.0f,5); DeliveryDrone dragon =newDeliveryDrone("Dragon",0.9f);System.out.println("> Station info:"); ads.printInfo();System.out.println("> A drone can dock at the station: "+ ads.canDock());System.out.println("> Approaching drone info:"); dragon.printInfo();int bayNumber = ads.dock(dragon);System.out.println("> Drone docked in bay number "+ bayNumber);System.out.println("> Station info:"); ads.printInfo();System.out.println("> A drone can dock at the station: "+ ads.canDock());}}

Task 1: Docking We would like to define a universal interface for our equipment and drones for docking. This way, when we develop new vehicles or stations we can implement the universal interface and know that it will behave in the same way. Instructions Create a Java interface called Dockable which has the following methods specified: a method called canDock that takes no parameters and returns a boolean a method called dock that takes a Drone as a parameter and returns an integer Task 2: Drones and Stations Now we want to test our docking interface, but first we want to define an abstract class for our drones from which we will model all of our designs after. Instructions Create an abstract class called Drone that has the following properties: a private attribute called name of type String a private attribute called weight of type double appropriate getters/setters for the attributes an abstract method called printInfo an abstract method called calculateTotalWeight that returns a double Create a subclass of Drone called AerialDockingStation that uses the Dockable interface Make sure that the AerialDockingStation class has the following properties: a private array of Drone objects that represents the docked drones The index of each object represents its docking number/bay Implement all of the necessary methods in AerialDockingStation canDock returns true if there is space for a drone to dock or false if the docking array is full dock must take a Drone as a parameter and add it to the array of docked drones: if the drone is added to the array, return the index of the drone if the drone cannot be added to the array return -1 calculateTotalWeight must return the weight of the AerialDockingStation that includes the weight of the docked drones if the AerialDockingStation weighs 2000 kg and it has one drone docked that weighs 400 kg then calculateTotalWeight should return 2400 printInfo must print out the name of the AerialDockingStation and a list of the docked drones (see sample output) if no drones are docked then it should print none Create a subclass of Drone called DeliveryDrone that implements the abstract methods of the Drone class: printInfo should print out the name and weight of the DeliveryDrone calculateTotalWeight should just return the weight of the DeliveryDrone Hint: the docking array may be partially filled. Sample Input/Output The following demo code produces the sample output: publicclass AssignmentDemo {publicstaticvoidmain(String[] args){ AerialDockingStation ads =newAerialDockingStation("ADS",4.0f,5); DeliveryDrone dragon =newDeliveryDrone("Dragon",0.9f);System.out.println("> Station info:"); ads.printInfo();System.out.println("> A drone can dock at the station: "+ ads.canDock());System.out.println("> Approaching drone info:"); dragon.printInfo();int bayNumber = ads.dock(dragon);System.out.println("> Drone docked in bay number "+ bayNumber);System.out.println("> Station info:"); ads.printInfo();System.out.println("> A drone can dock at the station: "+ ads.canDock());}}

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Task 1: Docking

We would like to define a universal interface for our equipment and drones for docking. This way, when we develop new vehicles or stations we can implement the universal interface and know that it will behave in the same way.

Instructions

Create a Java interface called Dockable which has the following methods specified:
- a method called canDock that takes no parameters and returns a boolean
- a method called dock that takes a Drone as a parameter and returns an integer

Task 2: Drones and Stations

Now we want to test our docking interface, but first we want to define an abstract class for our drones from which we will model all of our designs after.

Instructions

Create an abstract class called Drone that has the following properties:
- a private attribute called name of type String
- a private attribute called weight of type double
- appropriate getters/setters for the attributes
- an abstract method called printInfo
- an abstract method called calculateTotalWeight that returns a double
Create a subclass of Drone called AerialDockingStation that uses the Dockable interface
Make sure that the AerialDockingStation class has the following properties:
- a private array of Drone objects that represents the docked drones
  - The index of each object represents its docking number/bay
Implement all of the necessary methods in AerialDockingStation
- canDock returns true if there is space for a drone to dock or false if the docking array is full
- dock must take a Drone as a parameter and add it to the array of docked drones:
  - if the drone is added to the array, return the index of the drone
  - if the drone cannot be added to the array return -1
- calculateTotalWeight must return the weight of the AerialDockingStation that includes the weight of the docked drones
  - if the AerialDockingStation weighs 2000 kg and it has one drone docked that weighs 400 kg then calculateTotalWeight should return 2400
- printInfo must print out the name of the AerialDockingStation and a list of the docked drones (see sample output)
  - if no drones are docked then it should print none
Create a subclass of Drone called DeliveryDrone that implements the abstract methods of the Drone class:
- printInfo should print out the name and weight of the DeliveryDrone
- calculateTotalWeight should just return the weight of the DeliveryDrone

Hint: the docking array may be partially filled.

Sample Input/Output

The following demo code produces the sample output:

publicclass AssignmentDemo {publicstaticvoidmain(String[] args){ AerialDockingStation ads =newAerialDockingStation("ADS",4.0f,5); DeliveryDrone dragon =newDeliveryDrone("Dragon",0.9f);System.out.println("> Station info:"); ads.printInfo();System.out.println("> A drone can dock at the station: "+ ads.canDock());System.out.println("> Approaching drone info:"); dragon.printInfo();int bayNumber = ads.dock(dragon);System.out.println("> Drone docked in bay number "+ bayNumber);System.out.println("> Station info:"); ads.printInfo();System.out.println("> A drone can dock at the station: "+ ads.canDock());}}

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