Question

using java write a code with notepad++

Create the following classes using inheritance and polymorphism

1. Ship (all attributes private)
   • String attribute for the name of ship
   • float attribute for the maximum speed the of ship
   • int attribute for the year the ship was built
   • Add the following behaviors constructor(default and parameterized) , finalizer, and appropriate accessor and mutator methods
   • Override the toString() method to output in the following format if the attributes were name="Sailboat Sally", speed=35.0f and year built of 1980 be

     Ship named Sailboat Sally with max speed of 35.0 mph was built in 1980

2. CruiseShip extending Ship(all attributes private)
   • Additional int attribute for the maximum number of passengers
   • Add the following behaviors constructor(default and parameterized) , finalizer, and appropriate accessor and mutator methods
   • Override the toString() method to output in the following format if the attributes were name="Triumph", speed=52.0f and year built of 2007 and a maximum of 5500 passengers be

     Cruise Ship named Triumph with max speed of 52.0 mph was built in 2007 carries 5500 passengers

3. Cargo Ship extending Ship(all attributes private)
   • Additional float attribute for the maximum tons of cargo
   • Add the following behaviors constructor(default and parameterized) , finalizer, and appropriate accessor and mutator methods
   • Override the toString() method to output in the following format if the attributes were name="Valdez", speed=45.8f and year built of 1968 and a maximum of 350.3 tons be

     Cargo Ship named Valdez with max speed of 45.8 mph was built in 1968 with maximum cargo of 350.3 tons

4. AircraftCarrier extending CruiseShip(all attributes private)
   • Additional int attribute for the maximum number of planes
   • Add the following behaviors constructor(default and parameterized) , finalizer, and appropriate accessor and mutator methods
   • Override the toString() method to output in the following format if the attributes were name="Alabama", speed=55.5f and year built of 1939 and a maximum of 2300 crewmen and 42 planes

     Aircraft Carrier named Alabama with max speed of 55.5 mph was built in 1939 carries 2300 crew members with 42 planes

5. All derived class constructors should call the appropriate parent constructors
6. Create two instances of each class using both the parameterized and non parameterized constructors demonstrate all the methods accessible with each instance and send each instance to the System.out text or GUI messagebox using the toString()

Answer 1

Following is the answer:

Ship.java

public class Ship {
    private String name;
    private float maxSpeed;
    private int year;

    Ship(){}
    Ship(String name, float maxSpeed, int year){
        this.name = name;
        this.maxSpeed = maxSpeed;
        this.year = year;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public float getMaxSpeed() {
        return maxSpeed;
    }

    public void setMaxSpeed(float maxSpeed) {
        this.maxSpeed = maxSpeed;
    }

    public int getYear() {
        return year;
    }

    public void setYear(int year) {
        this.year = year;
    }

    @Override
    public String toString() {
        return "Ship named " + this.name + " with max speed of " +  this.maxSpeed + "mph was built in " + this.year;
    }
}

CruiseShip.java

public class CruiseShip extends Ship {
    private int maxPassengers;

    CruiseShip(){}
    CruiseShip(String name, float maxSpeed, int year, int maxPassengers){
        super(name, maxSpeed, year);
        this.maxPassengers = maxPassengers;
    }

    public int getMaxPassengers() {
        return maxPassengers;
    }

    public void setMaxPassengers(int maxPassengers) {
        this.maxPassengers = maxPassengers;
    }

    @Override
    public String toString() {
        return super.toString() + " carries " + this.maxPassengers + "passengers" ;
    }
}

CargoShip.java

public class CargoShip extends Ship {
    private float maxTons;
    CargoShip(){}
    CargoShip(String name, float maxSpeed, int year, float maxTons){
        super(name, maxSpeed, year);
        this.maxTons = maxTons;
    }

    public float getMaxTons() {
        return maxTons;
    }

    public void setMaxTons(float maxTons) {
        this.maxTons = maxTons;
    }

    @Override
    public String toString() {
        return super.toString() + " with maximum cargo of " + this.maxTons + " tons";
    }
}

AircraftCarrier.java

public class AircraftCarrier extends CruiseShip {
    private int maxPlane;
    AircraftCarrier(){}
    AircraftCarrier(String name, float maxSpeed, int year, int maxPassengers, int maxPlane){
        super(name, maxSpeed, year, maxPassengers);
        this.maxPlane = maxPlane;
    }

    public int getMaxPlane() {
        return maxPlane;
    }

    public void setMaxPlane(int maxPlane) {
        this.maxPlane = maxPlane;
    }

    @Override
    public String toString() {
        return super.toString() + " and " + this.maxPlane + " planes";
    }
}

main.java

public class main {
    public static void main(String[] args) {
        Ship ship = new Ship();
        ship.setName("Ship1");
        ship.setYear(2016);
        ship.setMaxSpeed(300);
        System.out.println("Ship1");
        System.out.println(ship.toString());

        Ship ship1 = new Ship("Ship2", 302.5f,2017);
        System.out.println("Ship2");
        System.out.println(ship1.toString());
        System.out.println("");

        CruiseShip cruiseShip1 = new CruiseShip();
        cruiseShip1.setName("Cruise1");
        cruiseShip1.setMaxPassengers(300);
        cruiseShip1.setMaxSpeed(300);
        cruiseShip1.setYear(2013);
        System.out.println("CruiseShip1");
        System.out.println(cruiseShip1.toString());

        CruiseShip cruiseShip2 = new CruiseShip("Cruise2",300,2015,200);
        System.out.println("CruiseShip2");
        System.out.println(cruiseShip2.toString());
        System.out.println("");

        CargoShip cargoShip1 = new CargoShip();
        cargoShip1.setName("Cargo1");
        cargoShip1.setMaxSpeed(300);
        cargoShip1.setMaxTons(1000);
        cargoShip1.setYear(2012);
        System.out.println("CargoShip1");
        System.out.println(cargoShip1.toString());

        CargoShip cargoShip2 = new CargoShip("Cargo2",250,2016,2000);
        System.out.println("CargoShip2");
        System.out.println(cargoShip2.toString());
        System.out.println("");

        AircraftCarrier aircraftCarrier1 = new AircraftCarrier();
        aircraftCarrier1.setMaxPlane(100);
        aircraftCarrier1.setMaxSpeed(1000);
        aircraftCarrier1.setName("AirCraft1");
        aircraftCarrier1.setYear(2015);
        aircraftCarrier1.setMaxPassengers(500);
        System.out.println("Aircraft1");
        System.out.println(aircraftCarrier1.toString());

        AircraftCarrier aircraftCarrier2 = new AircraftCarrier("AirCraft2", 1000, 2016,300, 200);
        System.out.println("AirCraft2");
        System.out.println(aircraftCarrier2.toString());

    }
}

Output: