我已经尝试了中断和将 `==` 更改为 `!=`。这仅是一个逻辑错误，因为除了循环永远不会结束外，其他所有操作都有效。
import javax.swing.JOptionPane;
import java.lang.Math;
public class NumGuess {
    public static void main(String[] args) {
        boolean anotherGame = true;
        int random = (int) (Math.random() * (20 - 0 + 1) + 0);
        int guesses = 5;
        int userGuess = -1;
        anotherGame = true;
        int invGuess = 0;
        while (anotherGame == true) {
            guesses = 5;
            userGuess = -1;
            random = (int) (Math.random() * (20 - 0 + 1) + 0);
            invGuess = 0;
            while (random != userGuess && guesses > 0) {
                userGuess = Integer.parseInt(JOptionPane.showInputDialog("Enter a number between 0 and 20."));
                while (userGuess < 0 || userGuess > 20) {
                    System.out.println("Enter an integer between 0 and 20.");
                    userGuess = Integer.parseInt(JOptionPane.showInputDialog("Enter a number between 0 and 20."));
                    invGuess++;
                }
                guesses--;
                if (random > userGuess) {
                    System.out.println("Higher!");
                    System.out.println("You have " + guesses + " tries left.");
                } else if (random < userGuess) {
                    System.out.println("Lower!");
                    System.out.println("You have " + guesses + " tries left.");
                } else {
                    System.out.println("You guessed correctly!");
                }
            }
            if (guesses == 0 && random != userGuess) {
                System.out.println("You have run out of guesses! The correct number was " + random + " .");
            }
            System.out.println("You had " + invGuess + " invalid guesses.");
            int anotherGameInt = JOptionPane.showConfirmDialog(null,
                    "Play again?", "Please select",
                    JOptionPane.YES_NO_OPTION);
            if (anotherGameInt == 1) {
                anotherGame = true;
            } else {
                anotherGame = false;
            }
        }
    }
}

JOptionPane.showConfirmDialog(null,
"Play again?", "Please select",
JOptionPane.YES_NO_OPTION);

<details>
<summary>英文:</summary>

returns ```JOption.YES_OPTION``` (1) for Yes and ```JOption.NO_OPTION``` (0) for no.
You can verify that with a ```System.out.println( anotherGameInt );``` after the call
</details>