为什么子类继承私有字段？

问：

我正在创建一个新类，即车辆。我希望唯一受保护的变量继承到子类。但是当我尝试使用 IDE 创建构造函数时，它也使用了超类私有变量？-这是私人字符串 vehicleName- 我不清楚这种情况。我不应该使用 auto Concstructor 吗？

public class Vehicle {
    protected int capacityOfPassengers;
    protected String mapOfRoute;
    private String vehicleName;

    public Vehicle(int capacityOfPassengers, String mapOfRoute, 
                   String vehicleName) {

        this.capacityOfPassengers = capacityOfPassengers;
        this.mapOfRoute = mapOfRoute;
        this.vehicleName = vehicleName;
    }
}

public class LandVehicle extends Vehicle {
    private String brand;
    private int priceModel;

    public LandVehicle(int capacityOfPassengers, String mapOfRoute, 
                       String vehicleName, String brand, int priceModel) {

        super(capacityOfPassengers, mapOfRoute, vehicleName);
        this.brand = brand;
        this.priceModel = priceModel;
    }
}