我运行的分配在第一次输入对话框后停止工作，我如何修复它？

Question

import javax.swing.JOptionPane;
import java.util.Scanner;

public class ShippingCost
{ 
   public static void main(String[] args) 
   {
      Scanner input= new Scanner(System.in);
      JOptionPane.showInputDialog("Please enter the length of your package: ");
      double length=input.nextDouble();
 
      JOptionPane.showInputDialog("Please enter the width of your package: ");
      double width=input.nextDouble();
 
      JOptionPane.showInputDialog("Please enter the height of your package: ");
      double height=input.nextDouble();
 
      double dimensions= length * width * height;
      System.out.println("The total dimensions of your package is: " + dimensions);
      
      double charge=0;
      double surcharge;
      double additionalCharge;
      double totalCost;
 

代码编译得很好，但是作为应用程序运行它来测试输入是我遇到的问题。第一个输入框出现，然后不会做任何其他点击回车键后。我是超级新的爪哇，只停留在这个...

Answer 1

您应该使用joptionpane.showInputDialog的返回值来获取用户的输入，例如。

double length = Double.valueOf(JOptionPane.showInputDialog("Please enter the length of your package: "));

诸如此类。