Java - 透明的JFrame,没有受限制的库

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

public class TransparentJFrame extends Application {

    @Override
    public void start(Stage primaryStage) {
        StackPane root = new StackPane();
        root.setStyle("-fx-background-color: transparent;");

        Scene scene = new Scene(root, 300, 250);
        scene.setFill(Color.TRANSPARENT);

        primaryStage.initStyle(StageStyle.TRANSPARENT);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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