Exercise:
A car dealer wants a computer system to manage the data of their vehicles and classify them by type.
All cars have the following data
- Engine serial number
- Brand
- Year
- Price
The vehicles are classified into compact cars, luxury cars, trucks and wagons.
For cars and wagons, it is also important to store the number of passengers; While for trucks the load capacity should be controlled in kgs. And the number of axes and rounds.
Model this system and instantiate each of the classes, assigning data through their respective properties. Add a parameterized constructor to each class to initialize its data and invoke the base class constructor from the constructor of each derived class (do not use default constructors).
Implement the override of the
toString()method to display the data for each type of auto. NOTE: Duplicate components are not allowed in classes or empty classes (no elements).
I'm just looking for some constructive (harsh) criticism of a homework I've done (the code works fine). Note that I didn't use getters and setters at all and I used private fields in the classes.
interface Passengers {
void setPassengers(int c);
int getPassengers();
}
abstract class Vehicle {
private int numSerieMotor;
private int year;
private String brand;
private double price;
Vehicle(int numSerieMotor, int year, String brand, double price) {
this.numSerieMotor = numSerieMotor;
this.year = year;
this.brand = brand;
this.price = price;
}
public String toString() {
return " numSerieMotor=" + numSerieMotor + ", year=" + year + ",
brand=" + brand + ", price="
+ price;
}
}
abstract class VehicPsj extends Vehicle implements Passengers {
private int psj;
VehicPsj(int numSerieMotor, int year, String brand, double price, int
psj) {
super(numSerieMotor, year, brand, price);
this.psj = psj;
}
public void setPassengers(int c) {
psj = c;
}
public int getPassengers() {
return psj;
}
public String toString() {
return super.toString() + "Passegers: " + psj;
}
}
class Acmpct extends VehicPsj {
Acmpct(int numSerieMotor, int year, String brand, double price, int
psj) {
super(numSerieMotor, year,brand, price, psj);
}
}
class Alux extends VehicPsj {
Alux(int numSerieMotor, int year, String brand, double price, int
psj) {
super(numSerieMotor, year, brand, price, psj);
}
}
class Vagon extends VehicPsj {
Vagon(int numSerieMotor, int year, String brand, double price, int
psj) {
super(numSerieMotor, year, brand, price, psj);
}
}
class Truck extends Vehicle {
private int capCharge;
private int axes;
private int wheel;
Truck(int numSerieMotor, int year, String brand, double price, int
capCharge, int axes,
int wheel) {
super(numSerieMotor, year,brand, price);
this.capCharge = capCharge;
this.axes = axes;
this.wheel = wheel;
}
public String toString() {
return "Truck: capCharge=" + capCharge+ ",
axes=" + axes
+ ",wheels=" + wheel +
super.toString();
}
}
public class Main {
public static void main(String[] args) {
Scanner x = new Scanner(System.in);
Vehicle v[] = new Vehicle[4];
System.out.println("Vagon data:" + "\n");
System.out.println("motor code:");
int numSerieMotor = x.nextInt();
System.out.println("brand");
x.nextLine();
String brand = x.nextLine();
System.out.println("year");
int year = x.nextInt();
System.out.println("price");
double price = x.nextDouble();
System.out.println("passengers");
int passengers = x.nextInt();
v[0] = new Vagon(numSerieMotor, year, brand, price, passengers);
x.nextLine();
System.out.println("luxury car data:" + "\n");
System.out.println("motor code");
int a = x.nextInt();
System.out.println("brand");
x.nextLine();
String b = x.nextLine();
System.out.println("year:");
int c = x.nextInt();
System.out.println("price:");
double d = x.nextDouble();
System.out.println("passengers:");
int e = x.nextInt();
v[1] = new Alux(a, c, b, d, e);
x.nextLine();
System.out.println("compact auto data:" + "\n");
System.out.println("motor code");
int f = x.nextInt();
System.out.println("brand");
x.nextLine();
String g = x.nextLine();
System.out.println("year");
int h = x.nextInt();
System.out.println("price:");
double i = x.nextDouble();
System.out.println("passengers:");
int j = x.nextInt();
v[2] = new Acmpct(f, h, g, i, j);
x.nextLine();
System.out.println(" truck data:" + "\n");
System.out.println("motor code");
int k = x.nextInt();
System.out.println("brand");
x.nextLine();
String l = x.nextLine();
System.out.println("year:");
int m = x.nextInt();
System.out.println("price:");
double n = x.nextDouble();
System.out.println("charge capacity:");
int p = x.nextInt();
System.out.println("axes:");
int q = x.nextInt();
System.out.println("wheels:");
int r = x.nextInt();
v[3] = new Truck(k, m, l, n, p, q, r);
x.nextLine();
for (int z = 0; z < 4; z++) {
System.out.println(v[z].toString() + " ");
}
}
}
