JavaFX在TextField上按模式设置输入筛选器

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.control.TextFormatter;
import javafx.stage.Stage;

public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextField textField = new TextField();
        
        // 设置输入筛选器
        TextFormatter<String> textFormatter = new TextFormatter<>(change -> {
            String newText = change.getControlNewText();
            if (newText.matches("[0-9]*")) {
                return change;
            }
            return null;
        });
        textField.setTextFormatter(textFormatter);
        
        primaryStage.setScene(new Scene(textField, 200, 100));
        primaryStage.show();
    }

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