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我如何獲得總成本作爲選項板顯示,以及其中的飲料。我被要求模擬貝貝最佳早餐的早餐訂購系統。我將顯示一個JOptionPane來提示用戶選擇早餐和飲料。然後,我提供一個提示,要求辦公室訂購這些早餐的數量(從1到5),並使用掃描儀對象閱讀他的輸入。然後在JOptionPane中輸出用戶的賬單。JOptionPane中的總成本沒有顯示
import javax.swing.*;
import java.util.Scanner;
import java.text.*;
import java.util.Locale;
public class ProjectFourA
{
private static final float bagel = 2.00f, donut = 1.50f, croissant = 3.00f;
private static final float latte = 1.50f, coffee = 1.25f, milk = 1.00f, tea = 0.50f;
private float cost,extracost;
public static void main(String[]args)
{
Scanner breakfast = new Scanner(System.in);
NumberFormat mfmt = NumberFormat.getCurrencyInstance(Locale.US);
int size, choice, num;
String ch = JOptionPane.showInputDialog("Welcome to BeBe's Best Breakfast choose a breakfast item." + "\n1 to order Bagel"+"\n2 to order Donut"+"\n3 to order Croissant");
choice = Integer.parseInt(ch);
String nm = JOptionPane.showInputDialog("Choose one of the following beverages:" + "\n1 for Latte"+"\n2 for Coffee"+"\n3 for Milk"+"\n4 for Tea");
num = Integer.parseInt(nm);
float cost=0.0f, extracost=0.0f;
float price;
String str="", topstr="";
if (choice == 1)
{
cost = bagel;
str = "Bagel";
String inputStr = JOptionPane.showInputDialog(null, "Enter quantity: 1-5");
inputStr = breakfast.nextLine();
}
else if (choice == 2)
{
cost = donut;
str = "Donut";
String inputStr = JOptionPane.showInputDialog(null, "Enter quantity: 1-5");
inputStr = breakfast.nextLine();
}
else if (choice == 3)
{
cost = croissant;
str = "Croissant";
String inputStr = JOptionPane.showInputDialog(null, "Enter quantity: 1-5");
inputStr = breakfast.nextLine();
}
float totCost = extracost + cost;
JOptionPane.showMessageDialog(null,("Breakfast ordered:" +str + "\nBeverage ordered: "+topstr + "\nTotal cost: $"+totCost));
}
}
我建議您儘量提高你的代碼,你在這裏發表的格式和一般的代碼。良好的格式,包括使用統一和一致的縮進樣式將幫助其他人(** us **!)更好地理解您的代碼,更重要的是,它將幫助您**更好地理解您的代碼,從而修復自己的錯誤。此外,這表明您願意付出額外的努力讓志願者更容易幫助您,而且這種努力非常值得讚賞。 –