TreeItem<String> treeRoot = new TreeItem<String>("Root");

treeRoot.setExpanded(true);

TreeItem<String> exportMr = new TreeItem<String>("Upload to HDFS");

treeRoot.getChildren().add(exportMr);

TreeView<String> treeView = new TreeView<String>(treeRoot);

treeView.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {

    @Override

    public void changed(ObservableValue observable, Object oldValue, Object newValue) {

        TreeItem<String> currentSelectItem = (TreeItem<String>) newValue;

        if (currentSelectItem != null&& currentSelectItem.getValue()=="Upload to HDFS") {

            System.out.println("selection(" + ((TreeItem<String>) newValue).getValue() + ") change");

            ModuleDialog md = new ModuleDialog(primaryStage);

        }

    }

});

treeView.setOnMouseClicked(new EventHandler<MouseEvent>()

{

    @Override

    public void handle(MouseEvent mouseEvent)

    {

        if(mouseEvent.getClickCount() == 2)

        {

            TreeItem<String> item = treeView.getSelectionModel().getSelectedItem();

            System.out.println("Selected Text : " + item.getValue());

            if (item.getValue()=="Upload to HDFS") {

                ModuleDialog md = new ModuleDialog(primaryStage);

            }

        }

    }

});