import javafx.application.Application; 
import javafx.beans.property.ReadOnlyStringWrapper; 
import javafx.scene.Group; 
import javafx.scene.Scene; 
import javafx.scene.control.TreeTableColumn; 
import javafx.scene.control.TreeTableColumn.CellDataFeatures; 
import javafx.scene.control.TreeItem; 
import javafx.scene.control.TreeTableView; 
import javafx.stage.Stage; 
import javafx.scene.image.Image; 
import javafx.scene.image.ImageView; 

public class TreeTableViewSample extends Application { 
    private static final Image icon = new Image(TreeTableViewSample.class.getResourceAsStream("icon.png")); 

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

    @Override 
    public void start(Stage stage) { 
        stage.setTitle("Tree Table View Samples"); 
        final Scene scene = new Scene(new Group(), 200, 400); 
        Group sceneRoot = (Group)scene.getRoot(); 

        //Creating tree items 
        final TreeItem<String> childNode1 = new TreeItem<>("Child Node 1", new ImageView(icon)); 
        final TreeItem<String> childNode2 = new TreeItem<>("Child Node 2", new ImageView(icon)); 
        final TreeItem<String> childNode3 = new TreeItem<>("Child Node 3", new ImageView(icon)); 

        //Creating the root element 
        final TreeItem<String> root = new TreeItem<>("Root node", new ImageView(icon)); 
        root.setExpanded(true); 

        //Adding tree items to the root 
        root.getChildren().setAll(childNode1, childNode2, childNode3); 

        //Creating a column 
        TreeTableColumn<String,String> column = new TreeTableColumn<>("Column"); 
        column.setPrefWidth(150); 

        //Defining cell content 
        column.setCellValueFactory((CellDataFeatures<String, String> p) -> 
            new ReadOnlyStringWrapper(p.getValue().getValue())); 

        //Creating a tree table view 
        final TreeTableView<String> treeTableView = new TreeTableView<>(root); 
        treeTableView.getColumns().add(column); 
        treeTableView.setPrefWidth(152); 
        treeTableView.setShowRoot(true); 
        sceneRoot.getChildren().add(treeTableView); 
        stage.setScene(scene); 
        stage.show(); 
    } 
}