java - 如何在java中按类型将文本文件中的信息排序到数组中？

Question

我正在尝试编写一个方法来读取如下所示的文本文件:

N 1000.0 NY 
R 2000.0 CA 0.09 
R 500.0 GA 0.07 
N 2000.0 WY 
O 3000.0 Japan 0.11 20.0 
N 555.50 CA 
O 3300.0 Ecuador 0.03 30.0 
R 600.0 NC 0.06

起始字母是不同类型的订单。每种类型的订单都有不同的参数。我希望该方法以如下格式从文本文件中读取订单:输入价格地点 [税率] [关税]。我的困惑点是如何按类型将数据排序到数组中。

public static ArrayList<Order> readOrders (String fileName)
{

    File file = new File (fileName);

    scan = null;
    try {
        scan = new Scanner(file);
    } catch (FileNotFoundException e) {
        System.out.println("Error, file not found: " + file.toString());
        e.printStackTrace();
    }

    Order[] order = new Order[8];

    for (int i = 0; i < order.length; i++) {
    String data = scan.nextLine(); // you need to use nextLine to read a whole line
    String[] val = data.split(" ");
    String type = val[0]; // Since its a String
    double price = Double.parseDouble(val[1]);
    String location = val[2];  // Since its a String
    double taxRate = 0.0; // Default values
    double tariff = 0.0; // Default values
    try { // Incase they are not present - error handling
    taxRate = Double.parseDouble(val[3]);
    tariff = Double.parseDouble(val[4]);
    } catch (ArrayIndexOutOfBoundsException e) {
}
    ArrayList <Order> orders =new ArrayList<Order>(Arrays.asList(order));
    return orders;

我无法让它与我的主要方法一起工作:

public static void main(String[] args) 
{
    ArrayList<Order> orders2 = readOrders("orders.txt"); 

    for( Order o2 : orders2) 
    { 
        System.out.println( o2.printOrder("Long")); 
    } 

    for( Order o2 : orders2) 
    { 
        System.out.println(o2.printOrder("Short")); 
    } 

}

这是我的错误代码:

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    The method printOrder(String) is undefined for the type Order
    The method printOrder(String) is undefined for the type Order

    at prob1.OrderTester.main(OrderTester.java:19)

Answer 1

嗯。这是一个编译错误。 Order 类不包含您正在调用的方法。例如。

    printOrder("Long")

检查类(class)顺序。这里你还没有提供