JavaFX中的Backspace按钮

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class BackspaceButtonExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextField textField = new TextField();
        Button backspaceButton = new Button("Backspace");

        backspaceButton.setOnAction(event -> {
            String text = textField.getText();
            if (!text.isEmpty()) {
                textField.setText(text.substring(0, text.length() - 1));
            }
        });

        VBox root = new VBox(10);
        root.setPadding(new Insets(10));
        root.getChildren().addAll(textField, backspaceButton);

        Scene scene = new Scene(root, 300, 200);
        primaryStage.setTitle("Backspace Button Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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