JavaFx TextField货币格式筛选器

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

import java.text.DecimalFormat;
import java.text.ParsePosition;
import java.util.function.UnaryOperator;

public class CurrencyFilterExample extends Application {

    @Override
    public void start(Stage primaryStage) {
        TextField textField = new TextField();
        textField.setTextFormatter(createCurrencyFormatter());

        VBox root = new VBox(textField);
        Scene scene = new Scene(root, 200, 100);

        primaryStage.setTitle("Currency Filter Example");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private TextFormatter<String> createCurrencyFormatter() {
        DecimalFormat format = new DecimalFormat("#,##0.00");
        UnaryOperator<TextFormatter.Change> filter = change -> {
            String newText = change.getControlNewText();
            ParsePosition parsePosition = new ParsePosition(0);
            format.parse(newText, parsePosition);
            if (newText.length() == parsePosition.getIndex()) {
                return change;
            }
            return null;
        };
        return new TextFormatter<>(filter);
    }

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