javafx clipboard

public class EffectTest extends Application {
public static void main(String[] args) {
launch(args);
}

@Override
public void start(Stage stage) {
Scene scene = new Scene(new Group());
stage.setTitle("Button Sample");
stage.setWidth(300);
stage.setHeight(190);

VBox vbox = new VBox();
vbox.setLayoutX(20);
vbox.setLayoutY(20);

final Button button1 = new Button("Accept");

button1.addEventHandler(MouseEvent.MOUSE_CLICKED,
new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent e) {

// DataFormat fmt = new DataFormat("text/foo", "text/bar");
Clipboard clipboard = Clipboard.getSystemClipboard();
// get data from Clipboard
System.out.println(" from System.Clipboard :"+clipboard.getString());

ClipboardContent content = new ClipboardContent();
// put data to system clipboard
content.putString(" test clipboard" );

clipboard.setContent(content);

}
});

vbox.getChildren().add(button1);
vbox.setSpacing(10);
((Group) scene.getRoot()).getChildren().add(vbox);

stage.setScene(scene);
stage.show();
}

}