java - 当用户输入 "0"时显示错误消息，无法退出 "error"消息

Question

知道如何解决这个问题吗？我告诉用户输入他想要平均的数字数量。当然，正如您在代码中看到的那样，如果他输入 0 或负数，我希望它标记用户输入另一个非 0 或负数的数字。问题是，一旦用户输入 0 或负数，它就会卡在那个状态，我必须终止程序。

帮忙吗？

import javax.swing.JOptionPane;

public class TestProgTres 
{
    public static void main(String[] args) 
    {
         //Variable Declaration
         String ShowSome;
         String ShowSomeAgain;
         int z           = 0;
         double avg      = 0;
         double totalamt = 0;

         ShowSome = JOptionPane.showInputDialog("Enter the amount of numbers you would like to average"); 
         double AllNumbers = Double.parseDouble(ShowSome);

         while (AllNumbers < 1)
         {
             JOptionPane.showInputDialog("You cannot enter a negative or a 0.  Enter the amount of numbers you would like to average");
             AllNumbers = Double.parseDouble(ShowSome);
         }//end while

             if (AllNumbers > 0)
             {
                 double Numbers [] = new double [(int) AllNumbers];

                 for (z = 0; z < Numbers.length; z++)
                 {
                     ShowSomeAgain= JOptionPane.showInputDialog("Enter number " + (z + 1));
                     Numbers[z]=Double.parseDouble(ShowSomeAgain);

                     totalamt += Numbers[z];
                     avg = totalamt/AllNumbers;
                 }
             }

              JOptionPane.showMessageDialog(null, "The  of the numberes entered is " + avg);
        }//end main
}// end class

Answer 1

嗯，它不是最干净的，但它有一个相当重要的错误，

ShowSome = JOptionPane.showInputDialog("Enter the amount of numbers "
    + "you would like to average"); 
double AllNumbers = Double.parseDouble(ShowSome);

while (AllNumbers < 1)
{
  JOptionPane.showInputDialog("You cannot enter a negative or a 0. "
      + "Enter the amount of numbers you would like to average");
  // HERE!
  AllNumbers = Double.parseDouble(ShowSome);
}//end while

您需要提示并更新 ShowSome。

while (AllNumbers < 1)
{
  // HERE!
  ShowSome = JOptionPane.showInputDialog("You cannot enter a negative or a 0. "
      + " Enter the amount of numbers you would like to average");
  // Get it again.
  AllNumbers = Double.parseDouble(ShowSome);
}//end while

此外，Java 命名约定会以小写字母开头命名您的变量。使用 showSome 会更容易阅读 ShowSome 看起来像一个类名。与 allNumbers 相同。