Question

please need help with the java program

A micro car rental company.

package yourLastName.cis4110.assignment5;

Please create an enum type, say Cartype, featuring all rental car types -- SUBCOMPACT, COMPACT, MIDSIZE, FULLSIZE

(You may put the enum definition in Car class)

class Car

Instance variables:

- private String plateNum

- private Cartype carType

- private boolean availability

Member methods:

            - Please define all setters and getters

class RentACar - This is a five car system for prototyping

instance variables:

- Car rentalCars[5] //a constant size so that you don't have to worry about handling the flexible size of the array.

member methods:

- public void setRentalCars(Car[] rentalcars) // array as a formal param

- public Car[] getRentalCars() //array as a return type; pay attention to deep copy

- public String rentACar(cartype) // eg. rentACar(Car.cartype.COMPACT);

     return plateNum if available, otherwise null or empty string "" //search through the rental car list and find the first available car of the type matching the argument; //Please note, once the car is rented, the car's availability should be set to false or 0.

-returnACar(platNum) //Reset the car's availability to true

classManageCars// or any name if you'd like. Put your main() function here to test your program.  

          In your main()      

          1). You may manually create five Car objects here, say Car[] myRentalCars = new Car[5]. No need to use Scanner to ask user to input data to save time. e.g.: You may directly put - rentalCar[0] = new Car(); rentalCar[0].setPlateNum("P1"); rentalCar[0].setCarSize(Car.rentalcar.COMPACT); rentalCar[0].setAvailability(true); or using a Car constructor of three parameters e.g.: new Car("P1", Car.rentalcar.COMPACT,1);

        2). Create a CarRental object, say myRental

          3)  myRental.setRentalCars(myRentalCars);

          4) Put a few calls to rentACar() and returnACar() of myRental to test your program. e.g.: myRental.rentACar(Car.cartype.COMPACT); myRental.rentACar(Car.cartype.MIDSIZE); myRental.returnACar("PlateNo1");

To add any additional properties, methods if necessary

Answer 1

The source code for the same is as follows:

Source Code:

package yourLastName.cis4110.assignment5;

class Car {

enum Cartype {
SUBCOMPACT, COMPACT, MIDSIZE, FULLSIZE
};

private String plateNum;
private Cartype carType;
private boolean availability;

public Car() {
}

public Car(String plateNum, Cartype carType, boolean availability) {
this.plateNum = plateNum;
this.carType = carType;
this.availability = availability;
}

public String getPlateNum() {
return plateNum;
}

public void setPlateNum(String plateNum) {
this.plateNum = plateNum;
}

public Cartype getCarType() {
return carType;
}

public void setCarType(Cartype carType) {
this.carType = carType;
}

public boolean getAvailability() {
return availability;
}

public void setAvailability(boolean availability) {
this.availability = availability;
}
}

class RentACar {

private Car rentalCar[] = new Car[5];

public void setRentalCars(Car[] rentalcars) {
for (int i = 0; i < 5; i++) {
rentalCar[i] = rentalcars[i];
}
}

public Car[] getRentalCars() {
Car cars[] = new Car[5];

for (int i = 0; i < 5; i++) {
cars[i] = rentalCar[i];
}

return cars;
}

public String rentACar(Car.Cartype c) {
for (int i = 0; i < 5; i++) {
if (rentalCar[i].getCarType() == c) {
rentalCar[i].setAvailability(false);
return rentalCar[i].getPlateNum();
}
}

return "";
}

public void returnACar(String platNum) {
for (int i = 0; i < 5; i++) {
if (rentalCar[i].getPlateNum().equals(platNum)) {
rentalCar[i].setAvailability(true);
break;
}
}
}
}

class ManageCars {

public static void main(String[] args) {
Car[] myRentalCars = new Car[5];
myRentalCars[0] = new Car();
myRentalCars[0].setPlateNum("P1");
myRentalCars[0].setCarType(Car.Cartype.COMPACT);
myRentalCars[0].setAvailability(true);

myRentalCars[1] = new Car("P2", Car.Cartype.SUBCOMPACT, true);
myRentalCars[2] = new Car("P3", Car.Cartype.FULLSIZE, true);
myRentalCars[3] = new Car("P4", Car.Cartype.MIDSIZE, true);
myRentalCars[4] = new Car("P5", Car.Cartype.SUBCOMPACT, true);

RentACar myRental = new RentACar();

myRental.setRentalCars(myRentalCars);

System.out.println("Car of type COMPACT rented having plate number: " + myRental.rentACar(Car.Cartype.COMPACT));
System.out.println("Car of type MIDSIZE rented having plate number: " + myRental.rentACar(Car.Cartype.MIDSIZE));

System.out.println("Returning a car with plate number P1");
myRental.returnACar("P1");
}
}

Output:

run: Car of type COMPACT rented having plate number: P1 Car of type MIDSIZE rented having plate number: P4 Returning a car with plate number P1 BUILD SUCCESSFUL (total time: 0 seconds)

Description:

Here I have written the 3 classes as needed.

At first, I am creating enum Cartype with 4 values.

Car class has 3 member variables and I have written a constructor for this, it was mentioned at the end that you can use the constructor so I defined it here.

Then I have created the getter and setter methods for every variable.

The next class is RentACar.

In this, I am defining an array of 5 Car object.

for setting and getting the array elements, deep copy is to be used.

This means you should copy each and every element of array from source to destination instead of just writing cars = rentalCar or rentalCar = cars.

If you write as above, it is shallow copying in which rentalCar and cars, both the object are pointing to the same location. But we need to make 2 arrays so both of the arrays must be different. So I have used a for loop which runs for 5 times, (number of car object times) and copying each and every array element i.e. object in setter and getter method.

In the rentACar(), a car type from above 4 is specified and if that type car is available, it is returned and its availability is set to false.

As it is asked that the first available car of that type is to be returned, I am using the for loop and iterating through every element, and when the first element of that car type is found, its availability is set to false and then the car object is returned.

If there is no such car object with that type, "" is returned.

The last method returnACar() is taking a plate number and then finding the car with that number plate and then sets its availability to true as this means this car was given for rent and now it is returned.

In the ManageCars class, I am writing a main() method in which I am creating a 5 Car object array and setting the values.

Then I am renting two cars, one with type COMPACT and the other with MIDSIZE.

So, for size COMPACT, car with number plate P1 is given for rent and for size MIDSIZE, car with number plate P4 is given for rent.

And then I am returning a car with number plate P1.

Do comment if there is any query. Thank you. :)