java - 如何添加 do-while 语句？

Question

我需要让它重复要求用户输入 1 到 10 之间的数字，但当输入任何数字时它就会终止。

import javax.swing.*;

public class Demo {
    public static void main (String [] args) {

       int n;

       n = Integer.parseInt(
               JOptionPane.showInputDialog(null,
                       "Enter a number between 1 and 10"));

       while (n < 1 && n > 10) {
               JOptionPane.showMessageDialog(null,"Your number is not between 1 and 10");
               n = Integer.parseInt(
                       JOptionPane.showInputDialog(null,
                               "Enter a number between 1 and 10"));
       }

       JOptionPane.showMessageDialog(null, "Good!\nClick OK to exit");
       System.exit(0);
   }
}

Answer 1

将AND更改为OR:

while (n < 1 || n > 10) { ... }

...并考虑将其转换为 do-while 循环的可能性，因为您必须至少显示该提示一次。

int n;
do {
   n = Integer.parseInt(JOptionPane.showInputDialog(null,
       "Enter a number between 1 and 10"));
   if (n >= 1 && n <= 10) {
     break;
   }
   JOptionPane.showMessageDialog(null,"Your number is not between 1 and 10");
} while (true);

// do something useful with n, will you? )