Question

所以我的问题是使用j选项窗格从用户那里获得“是”没有响应的好方法，然后如果答案是正确的，那么循环回我的程序。现在，我的程序会询问您是否要出售或购买东西然后从那里开始。理想情况下，我想问一下你是否愿意讨价还价，如果你说不，程序不再讨价还价，但如果你说是，那么它会问你是否要买或卖，然后完成后我会做喜欢问你是否愿意再次进行易货交易。任何帮助都很有用，谢谢。

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        ArrayList<Item> list = new ArrayList<Item>();

        list.add(new Item("Ketchup", 1.00, 10, 2.00, itemType.FOOD));
        list.add(new Item("Mayo", 2.00, 20, 3.0, itemType.FOOD));
        list.add(new Item("Bleach", 3.00, 30, 4.00, itemType.CLEANING));
        list.add(new Item("Lysol", 4.00, 40, 5.00, itemType.CLEANING));

do{
        int ogresponse = JOptionPane.showConfirmDialog(null,
                "Would you like to barter", "Please select",
                JOptionPane.YES_NO_OPTION);



        String response = JOptionPane.showInputDialog("Would you like to buy or sell items?").toLowerCase();


        if (response.equals("sell")) {

            String name_Item = JOptionPane.showInputDialog("What would you like to sell (options: Ketchup, Mayo, Bleach, or Lysol?").toLowerCase();
            String qty_Amount = JOptionPane.showInputDialog("How much of said item would you like to sell?").toLowerCase();
            int qty_num = Integer.parseInt(qty_Amount);
            sell(list, name_Item, qty_num);

        }else if (response.equals("buy")) {

            String name_Item = JOptionPane.showInputDialog("What would you like to buy (options: Ketchup, Mayo, Bleach, or Lysol?").toLowerCase();
            String qty_Amount = JOptionPane.showInputDialog("How much of said item would you like to buy?").toLowerCase();
            int qty_num = Integer.parseInt(qty_Amount);
            buy(list, name_Item, qty_num);
}while(ogrepsonse != 0);

        String output = "";
    for(Item i : list) {
        int everything = i.getQty();
        String everything2 = i.getName().toString();

        output += everything +" "+ everything2 + "\n";       
    }
    JOptionPane.showMessageDialog(null, "Your current balance is: $" + myBalance + "\n" + "Current stock:" + "\n" + output);


}

Answer 1

你可以使用do / while。只要用户想要继续迭代。我不确定ogresponse包含什么，但我假设1为否？希望这会有所帮助。

do{
     int ogresponse = JOptionPane.showConfirmDialog(null,
                "Would you like to barter", "Please select",
                JOptionPane.YES_NO_OPTION);
    System.out.println(ogresponse);


    String response = JOptionPane.showInputDialog("Would you like to buy or sell items?").toLowerCase();


    if (response.equals("sell")) {

        String name_Item = JOptionPane.showInputDialog("What would you like to sell (options: Ketchup, Mayo, Bleach, or Lysol?").toLowerCase();
        String qty_Amount = JOptionPane.showInputDialog("How much of said item would you like to sell?").toLowerCase();
        int qty_num = Integer.parseInt(qty_Amount);
        sell(list, name_Item, qty_num);

    }else if (response.equals("buy")) {

        String name_Item = JOptionPane.showInputDialog("What would you like to buy (options: Ketchup, Mayo, Bleach, or Lysol?").toLowerCase();
        String qty_Amount = JOptionPane.showInputDialog("How much of said item would you like to buy?").toLowerCase();
        int qty_num = Integer.parseInt(qty_Amount);
        buy(list, name_Item, qty_num);
       }
}while(ogresponse !=1);

Answer 2

尝试以下方法：

do {
  ogresponse = JOptionPane.showConfirmDialog(null, "Would you like to barter", "Please select", JOptionPane.YES_NO_OPTION);
  System.out.println(ogresponse);

  String response = JOptionPane.showInputDialog("Would you like to buy or sell items?").toLowerCase();
  if (response.equals("sell")) {
    String name_Item = JOptionPane.showInputDialog("What would you like to sell (options: Ketchup, Mayo, Bleach, or Lysol?").toLowerCase();
    String qty_Amount = JOptionPane.showInputDialog("How much of said item would you like to sell?").toLowerCase();
    int qty_num = Integer.parseInt(qty_Amount);
    sell(list, name_Item, qty_num);
  } else if (response.equals("buy")) {
    String name_Item = JOptionPane.showInputDialog("What would you like to buy (options: Ketchup, Mayo, Bleach, or Lysol?").toLowerCase();
    String qty_Amount = JOptionPane.showInputDialog("How much of said item would you like to buy?").toLowerCase(); 
    int qty_num = Integer.parseInt(qty_Amount);
    buy(list, name_Item, qty_num);
  }
} while (ogresponse != 1);

如何循环回来并使用用户输入

2 个答案: