代码有效，但当我移动滑块时，它不会改变难度。

这是代码，请帮助我今天需要它：

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Orientation;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Slider;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

import java.util.Random;

public class numgame extends Application {
private int answer;
private Label levelLabel;
private Slider difficultySlider;
private Label resultLabel;
private TextField guessField;

public void start(Stage stage) {
levelLabel = new Label("Easy");
difficultySlider = new Slider(1, 3, 0);
difficultySlider.setOrientation(Orientation.VERTICAL);
difficultySlider.setShowTickLabels(true);
difficultySlider.setShowTickMarks(true);
difficultySlider.setMajorTickUnit(1);
difficultySlider.setBlockIncrement(1);
resultLabel = new Label();
guessField = new TextField();
Button guessButton = new Button("Guess");
guessButton.setOnAction(e -> guessNumber());
GridPane gridPane = new GridPane();
gridPane.setAlignment(Pos.CENTER);
gridPane.setHgap(10);
gridPane.setVgap(10);
gridPane.setPadding(new Insets(25, 25, 25, 25));
gridPane.add(new Label("Guess the number:"), 0, 0);
gridPane.add(guessField, 1, 0);
gridPane.add(guessButton, 2, 0);
gridPane.add(resultLabel, 1, 1);
HBox sliderBox = new HBox();
sliderBox.setAlignment(Pos.CENTER);
sliderBox.getChildren().addAll(new Label("Difficulty Level: "), levelLabel,      difficultySlider);
VBox vbox = new VBox();
vbox.setAlignment(Pos.CENTER);
vbox.getChildren().addAll(sliderBox, gridPane);

Scene scene = new Scene(vbox, 400, 200);
stage.setTitle("Number Guessing Game");
stage.setScene(scene);
stage.show();

setLevel(difficultySlider.getValue());
}

private void guessNumber() {
try {
int guess = Integer.parseInt(guessField.getText());
if (guess == answer) {
resultLabel.setText("You guessed correctly!");
} else {
resultLabel.setText("Sorry, the correct answer is " + answer);
}
} catch (NumberFormatException e) {
resultLabel.setText("Invalid input. Please enter an integer.");
}
}

private void setLevel(double level) {
int max = 0;
switch ((int) level) {
case 1:
levelLabel.setText("Easy");
max = 10;
break;
case 2:
levelLabel.setText("Medium");
max = 50;
break;
case 3:
levelLabel.setText("Hard");
max = 100;
break;
}
answer = new Random().nextInt(max) + 1;
}

public static void main(String[] args) {
launch(args);
}
}

我今天期末考试需要这个作业，但是我不知道如何解决它，我想尽了一切办法，所以请帮帮我

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