Java 我一直在获取数组的最后一个输入

因此，用户必须输入一个类似“Select 1”的代码，然后输入“Options”。这些选项应该在最上面给出ArrayList的输出，而不是在最下面给出ArrayList的输出。我被要求使用4类以及。提前谢谢你！如果需要，我还可以提供更多详细信息！：]

编辑：当用户输入“选择1”时，应给出用户选择的汽车。当他在之后输入“选项”时，它应该为此人提供3个特定汽车的选项。除此之外，它只为我的数组中的选项提供最后一个输入

public static void main(String[] args) 
{  
    Dealership dealership = new Dealership();
    System.out.println("To view a list of commands, enter Commands");   
    Scanner sc = new Scanner(System.in);
    while(true)
    {
        String input = sc.nextLine();
        String[] parts = input.split(" ");
        switch(parts[0])
        {
            case "Commands": 
                System.out.println("Commands: shows a list of all available commands\n" +
                "Select [n]: selects car No. n and shows the details\n" +
                "Options: show the details of options installed on the selected car\n" +
                break;

            case "Options":
                System.out.println(dealership.ShowOptions());
                break;
}

经销商。等级

{
private Car[] cars;  
private Car selectedCar; 
public Dealership() // Resonsibility: Hold the inventory of cars.
{ 

    cars = new Car[10]; // 3 means there is 3 cars that goes from 0, 1, 2 which also is car 1, 2, 3

    Engine engine = new Engine(FuelType.Gas, 4, 67001, 162, 24); //FuelType, int noOfCylinders, int capacity, int horsePower, float mpg
    Interior interior = new Interior("Brown", "Maroon", false, false); //(String color1, String color2, boolean hasSunRoof, boolean hasMoonRoof)
    Trunk trunk = new Trunk(true, false, true, true, "White"); // (boolean hasSpareTire, boolean hasFirstAidKit, boolean hasCarpet, boolean hasJack, String carpetColor)
    Car car = new Car("Hyundai", 2006, "Sonata", 2500, "White", CarType.Sedan, engine, interior, trunk); // Parameter in the Public Car.Class section

    cars[0] = car; // 

    engine = new Engine(FuelType.Gas, 4, 75708, 325, 17); 
    interior = new Interior("Black", "Blue", true, false); 
    trunk = new Trunk(true, false, true, false, "Black"); 
    car = new Car("Infiniti", 2016, "QX50", 38000, "Black", CarType.Sedan, engine, interior, trunk);   

    cars[1] = car; 

    engine = new Engine(FuelType.Gas, 4, 49967, 132, 26); 
    interior = new Interior("White", "Beige", true, true); 
    trunk = new Trunk(true, false, true, true, "Brown"); 
    car = new Car("Toyota", 2010, "Corolla", 7845, "Red", CarType.Sedan, engine, interior, trunk);  

    cars[2] = car;



   public String ListAllCars()  //Responsibility: Returns a description of all cars
    {

    String result = ""; 
    for(int i = 0; i < cars.length; i++)
    { 
        Car c = cars[i]; 
        String s = c.toString(); 
        result = result + (i+1) + "-" + s + "\n";
    } 
    return result;
    }

public String SelectCar (int index) 
{ 
    selectedCar =  cars[index - 1]; 
    return selectedCar.toString(); 
}

public String ShowOptions() // Responsibility: Returns the options installed on the selected car
{
    if(selectedCar != null)  
        return selectedCar.ShowOptions();
    else
        return "Please select a car first";

}
}

选项。类

{
private String name;
private String name2;
private String name3;
private String description;
private String description2;
private String description3;
    public Option (String name, String description, String name2, String description2, String name3, String description3)
    {
        this.name = name;
        this.name2 = name2;
        this.name3 = name3;
        this.description = description;
        this.description2 = description2;
        this.description3 = description3;
    }
    public String toString() //Responsibility: Returns a description of the option(Name, Description)
    {
        String options = "The first option for this car has " + name + description + ", the second option for this car has" + name2 + description2 + ","
        + " and the third option for this car has" + name3 + description3 + ".";
        return options;
    }
}

---

在Car类中，您应该返回options.toString（），您的经销商类应该返回一个字符串数组。

显示您现在拥有的内容和期望的内容。您的问题很难理解，因此请添加更多细节

main（）

毫无意义。什么是

selectedCar

ShowOptions

仅返回

option

最后一个值的字符串，而不是您以前放入数组的所有值。对不起，没有问题，但如何返回字符串数组？我的脑子有点紧张。返回类型应该是String[]

{
private String name;
private String name2;
private String name3;
private String description;
private String description2;
private String description3;
    public Option (String name, String description, String name2, String description2, String name3, String description3)
    {
        this.name = name;
        this.name2 = name2;
        this.name3 = name3;
        this.description = description;
        this.description2 = description2;
        this.description3 = description3;
    }
    public String toString() //Responsibility: Returns a description of the option(Name, Description)
    {
        String options = "The first option for this car has " + name + description + ", the second option for this car has" + name2 + description2 + ","
        + " and the third option for this car has" + name3 + description3 + ".";
        return options;
    }
}