增加车辆与构造数组列表

Question

我已经创建了我的课叫做汽车（）;我现在需要创建一个自动库存计划，以增加车辆，车辆打印的清单，删除车辆，并更新属性的方法。

我很困惑上，是我怎么调用构造函数来创建一个新的车，而接受用户输入构造对象，并在构造函数中的字段？

这是我的课：

public class AutoMobile {

//initialize private variables
private String make;
private String model;
private String color;
private int year;
private int mileage;

public AutoMobile() {
    this("Default make", "Default model", "Default color", 2019, 0);
    System.out.println("Empty constructor called");
}

public AutoMobile(String make, String model, String color, int year, int mileage) {
    this.make = make;
    this.model = model;
    this.color = color;
    this.year = year;
    this.mileage = mileage;
}

我能够做，所以我可以在主列表中。不过，我有一个艰难的时间，如何打印出清单的内容。

public class Main {


public static AutoMobile addAuto(List<AutoMobile> autoInventory) {
    Scanner addCar = new Scanner(System.in);

    System.out.println("Enter Vehicle Make: ");
    String make = addCar.nextLine();

    System.out.println("Enter Vehicle Model: ");
    String model = addCar.nextLine();

    System.out.println("Enter Vehicle Color: ");
    String color = addCar.nextLine();

    System.out.println("Enter Vehicle Year: ");
    int year = addCar.nextInt();

    System.out.println("Enter Vehicle Mileage: ");
    int mileage = addCar.nextInt();

    AutoMobile car =  new AutoMobile(make, model, color, year, mileage);

    autoInventory.add(car);

    addCar.close();

  return car;


}

public static void removeAuto() {
    //todo will be used to remove auto from invetory list

}

public static void printVehicles(List<AutoMobile> autoInventory) {
    //todo allows user to print inventory lsit

}

public static void updateAttributes() {
    //todo allows user to update attribute of specific vehicle

}


public static void main(String[] args) {
    List<AutoMobile> autoInventory = new ArrayList<AutoMobile>();

   AutoMobile newCar = (addAuto(autoInventory));

    for (AutoMobile val: autoInventory) {
        System.out.println(val);

    }



}

}

这不是印刷的实际列表：

Answer 1

你不必当实例它来定义汽车的所有属性。当您去，您可以设置其属性。举例来说，如果构造是这样的：

public AutoMobile(String color, String type) {
    this.color = color;
    this.type = type;
}

和你有一个属性，叫做manufacturer，那么这是很好的定义部件private或protected：

private String manufacturer;

并定义一个getter和它二传手：

public String getManufacturer() {
    return manufacturer;
}

public AutoMobile setManufacturer(String manufacturer) {
    this.setManufacturer = manufacturer;
    return this; //You can chain setters this way, but the method can be void as
    //well if that's your preference
}