java - 卡在java中的输出错误

Question

我的 java 程序中出现输出错误。我的程序是一个简单的猜谜游戏，它从用户那里获取一个数字并创建一个随机数。然后它找到这些数字之间的差异并将其显示给用户。我是初学者，所以请提供简单的指导。谢谢。这是我的代码:

import javax.swing.JOptionPane;
public class RandomGuessMatch
{
   public static void main(String[] args)
   {
      int random_Number, user_Number, difference;
      String random;

      random_Number = 1 + (int)(Math.random() * 100);

      user_Number = JOptionPane.showInputDialog(null,
         "Please guess a number between 1 to 5." + "Please input your number",
         "Guessing Game", JOptionPane.INFORMATION_MESSAGE);

      difference = JOptionPane.showMessageDialog(null,
         "The difference between my number and your number is " + user_Number - random_Number,
         "Guessing Game", JOptionPane.INFORMATION_MESSAGE);

      boolean valid = random_Number == user_Number;
      JOptionPane.showMessageDialog(null,
         "Does your number and my number match?" + "\n" + valid,
         "Guessing Game", JOptionPane.INFORMATION_MESSAGE);
   }
}

这是我得到的错误(我使用 jGrasp):

RandomGuessMatch.java:13: error: incompatible types: String cannot be converted to int
      user_Number = JOptionPane.showInputDialog(null,

RandomGuessMatch.java:18: error: bad operand types for binary operator '-'
         "The difference between my number and your number is " + user_Number - random_Number,

Answer 1

您可以尝试如下所示。此代码有效。

import javax.swing.JOptionPane;
public class RandomGuessMatch {
public static void main(String[] args) {
    int random_Number, difference;
    String user_Number;
    String random;

    random_Number = 1 + (int) (Math.random() * 100);
    System.out.println(random_Number);

    user_Number = JOptionPane.showInputDialog(null,
            "Please guess a number between 1 to 5." + "Please input your number", "Guessing Game",
            JOptionPane.INFORMATION_MESSAGE);

    JOptionPane.showMessageDialog(null,
            "The difference between my number and your number is "
                    + (Integer.parseInt(user_Number) - random_Number),
            "Guessing Game", JOptionPane.INFORMATION_MESSAGE);

    boolean valid = (random_Number == Integer.parseInt(user_Number));
    JOptionPane.showMessageDialog(null, "Does your number and my number match?" + "\n" + valid, "Guessing Game",
            JOptionPane.INFORMATION_MESSAGE);
}
}