无法识别机票等级？

Question

我是一个初学者，我必须制作一个程序，该程序允许用户选择多种类型的票证和数量，然后打印出来。我尝试使用类，但无法识别类的实例。如果您还对如何制定更好的票务计划有任何建议，请告诉我，因为我也很难理解解决此问题的最佳方法。

import hsa.Console;
import java.awt.*;
import javax.imageio.*;
import java.io.*;

public class raps
{
  static Console c;
  static Image image;
  public static void main(String[] args)
  { 

    c = new Console();
    image = null;

    //Copy and paste this below every time you want to put in a new picture

    {

      ticket first = new ticket();
      ticket.selection = 'A';
      ticket.ticketType = "Courtside Prime";
      ticket.price = 360.00;

      ticket second = new ticket();
      ticket.selection = 'B';
      ticket.ticketType = "Baseline Prime";
      ticket.price = 106.50;

      ticket third = new ticket();
      ticket.selection = 'C';
      ticket.ticketType = "Box Seat";
      ticket.price = 97.00;

      ticket fourth = new ticket();
      ticket.selection = 'D';
      ticket.ticketType = "Lower Bowl";
      ticket.price = 94.50;

      ticket fifth = new ticket();
      ticket.selection = 'E';
      ticket.ticketType = "Upper Bowl";
      ticket.price = 91.00;

      ticket fifth = new ticket();
      ticket.selection = 'F';
      ticket.ticketType = "Drake Zone";
      ticket.price = 50.00;



      /*c.println(" A | Courtside Prime | $360.00 ");
      c.println(" B | Baseline Prime  | $106.50 ");
      c.println(" C |     Box Seat    | $97.00 ");
      c.println(" D |    Lower Bowl   | $94.50 ");
      c.println(" E |    Upper Bowl   | $91.00 ");
      c.println(" F |    Drake Zone   | $50.00 ");
      c.println("Enter the letter of the seat section you would like to select");
      */

      class ticket{
        char selection;          //The Letter of Selection The User will choose ex. A, B, C etc.
        String ticketType;      //The type of ticket the user will choose ex. Courtside Prime, Baseline Prime etc.
        double price;          //The price of each ticket

      }




    }





  }
}

Java

Answer 1

我认为您如何设置它有两个基本问题。我倾向于将Ticket类移出该方法。

public class Raps {
  static Console c;
  static Image image;

  static class Ticket {
    char selection;          //The Letter of Selection The User will choose ex. A, B, C etc.
    String ticketType;      //The type of ticket the user will choose ex. Courtside Prime, Baseline Prime etc.
    double price;          //The price of each ticket

  }


  public static void main(String[] args) {
  ...

您的代码使用的是类名而不是变量。

        Ticket first = new Ticket();
        first.selection = 'A';
        first.ticketType = "Courtside Prime";
        first.price = 360.00;

也是最佳做法：以大写字母开头的类。这样可以消除类和变量之间的某些混淆。

避免在静态方法中放入太多代码。稍后，当您开始使用继承（扩展）时，将无法覆盖静态方法，并且您很有可能必须进行一些重构。

将main更改为类似

private Console c;
private Image image;

public static void main (String[] args) {
    Raps raps = new Raps();
    raps.createTickets();
}

private void createTickets() {
    // all of your code here
}

Answer 2

因为它是static方法，所以将其读取为过程代码。直到到达此行ticket first = new ticket();时，ticket才知道class ticket{是什么。