Создание объектов Java

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
 
public class Test {
    public static void main(String[] args) {
        try (Scanner in = new Scanner(System.in)) {
            System.out.print("Length: ");
            int length = in.nextInt();
            
            System.out.println();
            
            Car[] cars = new Car[length];
            
            readCarArray(cars, in);
            writeCarArray(cars);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    private static void readCarArray(Car[] cars, Scanner in) {
        for (int i = 0; i < cars.length; i++) {
            cars[i] = new Car();
            
            System.out.printf("\tCar %d of %d\n", i + 1, cars.length);
            
            System.out.print("Weight: ");
            double weight = in.nextDouble();
            
            cars[i].setWeight(weight);
            
            System.out.println();
        }
    }
    
    private static void writeCarArray(Car[] cars) throws IOException {
        try (PrintWriter pw = new PrintWriter("/home/okno/Downloads/cars.txt", "UTF-8")) {
            for (Car car : cars) {
                pw.println(car);
            }
        }
    }
}
 
class Car {
    private double weight;
    
    public Car() {
        
    }
    
    public Car(double weight) {
        this.weight = weight;
    }
    
    public double getWeight() {
        return weight;
    }
    
    public void setWeight(double newWeight) {
        weight = newWeight;
    }
    
    public String toString() {
        return "Car[weight=" + weight + "]";
    }
}