我的代碼應該要求用戶輸入一個 1 到 10 之間的數字。如果他們輸入一個 1 到 10 之間的數字，那么它會說謝謝并到此結束。如果不是，它應該回圈并說，請輸入一個介于 1 和 10 之間的數字，然后再試一次。然后它將再次使用戶輸入。我的問題是，在第二次輸入后，即使他們第二次輸入錯誤，它也會自動結束回圈。順便說一句，我對編碼很陌生，所以請在評論中對我放輕松 XD。有人請幫忙，謝謝。這是我的代碼：
import javax.swing.*;
public class LoopLecture {
public static void main(String[] args) {
int MIN = 1;
int MAX = 10;
String rating;
rating = JOptionPane.showInputDialog(null, "Please enter your rating of Krabbypatties on a scale of"
MIN "to" MAX ".With" MIN "meaning youhated it and" MAX "meaning you loved it.");
int rating2 = Integer.parseInt(rating);
while (rating2 < MIN || rating2 > MAX) {
JOptionPane.showMessageDialog(null, "You must enter a value between " MIN "and" MAX ".");
JOptionPane.showMessageDialog(null, "Please try again.");
rating = JOptionPane.showInputDialog(null, "Please enter your rating of Krabbypatties on a scale of"
MIN "to" MAX ".With" MIN "meaning youhated it and" MAX "meaning you loved it.");
if (rating2 >= MIN && rating2 <= MAX)
break;
}
JOptionPane.showMessageDialog(null, "Thank you!");
}
}
uj5u.com熱心網友回復：
在 for 回圈中嘗試將新值分配給 rating2
rating = JOptionPane.showInputDialog(null, "請輸入您對 Krabby 的評分
rating2 = JOptionPane.showInputDialog(null, "請輸入您對 Krabby 的評分
uj5u.com熱心網友回復：
while (true) { // creates infinite while loop
break; // ends an infinite loop
}
你的 if 陳述句中有一個break;運算式，所以我相信你明白它是如何作業的，但試著讓回圈無限，如上所示。
uj5u.com熱心網友回復：
更好地解決它：
- 決議
rating為rating2回圈 - 如果數字在 1 到 10 之間，則中斷
- catch
NumberFormatException，不需要做任何事情，忽略它
public static void main(String[] args) {
int MIN = 1;
int MAX = 10;
String rating = JOptionPane.showInputDialog(null, "Please enter your rating of Krabbypatties on a scale of"
MIN "to" MAX ".With" MIN "meaning youhated it and" MAX "meaning you loved it.");
while (true) {
try {
int rating2 = Integer.parseInt(rating);
if (rating2 >= MIN && rating2 <= MAX) {
break;
}
} catch (NumberFormatException ignored) {
}
JOptionPane.showMessageDialog(null, "You must enter a value between " MIN "and" MAX ".");
JOptionPane.showMessageDialog(null, "Please try again.");
rating = JOptionPane.showInputDialog(null, "Please enter your rating of Krabbypatties on a scale of"
MIN "to" MAX ".With" MIN "meaning youhated it and" MAX "meaning you loved it.");
}
JOptionPane.showMessageDialog(null, "Thank you!");
}
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