JavaFX TableView in TableView (JavaFx Tree like TableView)

TreeTableView.java

import java.util.ArrayList;
import java.util.List;

import javafx.application.Application;
import javafx.beans.property.SimpleStringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableRow;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;

public class TreeTableView extends Application {
	private TableView<Person> table = new TableView<Person>();

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

	@Override
	public void start(Stage stage) {
		Scene scene = new Scene(new Group());
		stage.setTitle("Table View Sample");
		stage.setWidth(450);
		stage.setHeight(500);

		final Label label = new Label("Address Book");
		label.setFont(new Font("Arial", 20));

		constructTable();
		final VBox vbox = new VBox();
		vbox.setSpacing(5);
		vbox.setPadding(new Insets(10, 0, 0, 10));
		vbox.getChildren().addAll(label, table);

		((Group) scene.getRoot()).getChildren().addAll(vbox);

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

	private void constructTable() {
		TableColumn<Person, String> firstNameCol = new TableColumn<Person, String>("First Name");
		firstNameCol.setMinWidth(100);
		firstNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("firstName"));

		TableColumn<Person, String> lastNameCol = new TableColumn<Person, String>("Last Name");
		lastNameCol.setMinWidth(100);
		lastNameCol.setCellValueFactory(new PropertyValueFactory<Person, String>("lastName"));

		TableColumn<Person, String> emailCol = new TableColumn<Person, String>("Email");
		emailCol.setMinWidth(200);
		emailCol.setCellValueFactory(new PropertyValueFactory<Person, String>("email"));

		table.setItems(getData());
		table.getColumns().addAll(firstNameCol, lastNameCol, emailCol);
		
		table.setRowFactory(tv -> new TableRow<Person>() {
	            Node detailsPane ;
	            {
	                this.selectedProperty().addListener((obs, wasSelected, isNowSelected) -> {
	                    if (isNowSelected ) {
	                    	detailsPane = constructSubTable(getItem());
	                        this.getChildren().add(detailsPane);
	                    } else {
	                        this.getChildren().remove(detailsPane);
	                    }
	                    this.requestLayout();
	                });
	                
	            }

	            @Override
	            protected double computePrefHeight(double width) {
	                if (isSelected()) {
	                    return super.computePrefHeight(width)+detailsPane.prefHeight(60);
	                } else {
	                    return super.computePrefHeight(width);
	                }
	            }

	            @Override
	            protected void layoutChildren() {
	                super.layoutChildren();
	                if (isSelected()) {
	                    double width = getWidth();
	                    double paneHeight = detailsPane.prefHeight(width);
	                    detailsPane.resizeRelocate(0, getHeight()-paneHeight, width, paneHeight);
	                } 
	            }
	        });
	}
	
	private TableView<Address> constructSubTable(Person person) {
		
		List<Address> addresses = new ArrayList<>(); addresses.add(person.getAddress());
		
		TableView<Address> subTable = new TableView<Address>();
		TableColumn<Address, String> streetCol = new TableColumn<Address, String>("Street");
		streetCol.setMinWidth(100);
		streetCol.setCellValueFactory(new PropertyValueFactory<Address, String>("Street"));

		TableColumn<Address, String> cityCol = new TableColumn<Address, String>("City");
		cityCol.setMinWidth(100);
		cityCol.setCellValueFactory(new PropertyValueFactory<Address, String>("city"));

		subTable.setItems(FXCollections.observableArrayList(addresses));
		subTable.getColumns().addAll(streetCol, cityCol);
		subTable.setPrefHeight(50+(addresses.size()*30));
		subTable.setStyle("-fx-border-color: #42bff4;");
		return subTable;
	}

	
	private ObservableList<Person> getData() {
		return FXCollections.observableArrayList(new Person("Jacob", "Smith", "jacob.smith@example.com","Jacob Street","NY"),
				new Person("Isabella", "Johnson", "isabella.johnson@example.com","Isabella Street","DL"),
				new Person("Ethan", "Williams", "ethan.williams@example.com","Ethan Street"," ML"),
				new Person("Emma", "Jones", "emma.jones@example.com","Emma Street","EL"),
				new Person("Michael", "Brown", "michael.brown@example.com","Michael Street","ML"));
	}

	public static class Person {
		private final SimpleStringProperty firstName;
		private final SimpleStringProperty lastName;
		private final SimpleStringProperty email;
		private Address address;
		
		Person(String fName, String lName, String email,String streetS, String cityS) {
			this.firstName = new SimpleStringProperty(fName);
			this.lastName = new SimpleStringProperty(lName);
			this.email = new SimpleStringProperty(email);
			address = new Address(streetS, cityS);
		}

		public String getFirstName() {
			return firstName.get();
		}

		public void setFirstName(String fName) {
			firstName.set(fName);
		}

		public String getLastName() {
			return lastName.get();
		}

		public void setLastName(String fName) {
			lastName.set(fName);
		}

		public String getEmail() {
			return email.get();
		}

		public void setEmail(String fName) {
			email.set(fName);
		}

		public Address getAddress() {
			return address;
		}

		public void setAddress(Address address) {
			this.address = address;
		}
		
	}
   public static class Address{
	    private final SimpleStringProperty street;
		private final SimpleStringProperty city;
		
		Address(String streetS, String cityS) {
			this.street = new SimpleStringProperty(streetS);
			this.city = new SimpleStringProperty(cityS);
		}
		public String getStreet() {
			return street.get();
		}

		public void setStreet(String streetS) {
			street.set(streetS);
		}
		
		public String getCity() {
			return city.get();
		}

		public void setCity(String cityS) {
			city.set(cityS);
		}
   }
}