ピアノかな

package piano;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class pro extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        
        
        
        
        Button btn = new Button();
        btn.setText("音");
        btn.setOnAction(new EventHandler() {
            @Override
            public void handle(ActionEvent event) {
                
                oto p=new oto();
                p.makedata();
                
            }
        });
        
        StackPane root = new StackPane();
        root.getChildren().add(btn);
        
        Scene scene = new Scene(root, 300, 250);
        
        primaryStage.setTitle("Piano");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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