How to get a comboBox show a listview after selection

This is a personal project, but im stuck and hoping someone here can help.

I have this application where I want to be able to select an option in a combobox, eg. fruits or beverages. The selection should then show a list with different fruits or different beverages in a listview - but how do I do that?

I've been working on something here:

main class:

package grocerylist;

import javafx.application.Application; import static javafx.application.Application.launch; import javafx.beans.value.ChangeListener; import javafx.beans.value.ObservableValue; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.event.ActionEvent; import javafx.event.EventHandler; import javafx.geometry.Insets; import javafx.scene.Scene; import javafx.scene.control.ComboBox; import javafx.scene.control.Label; import javafx.scene.control.ListView; import javafx.scene.control.TextArea; import javafx.scene.control.TextField; import javafx.scene.layout.BorderPane; import javafx.scene.layout.ColumnConstraints; import javafx.scene.layout.GridPane; import javafx.scene.layout.Priority; import javafx.scene.text.Font; import javafx.scene.text.FontWeight; import javafx.scene.text.Text; import javafx.stage.Stage;

public class GroceryList extends Application { FruitVeg fruitVegList; Beverages beverageList; Bread breadList; ComboBox comboBox; ListView lv1; ListView lv2;

@Override public void start(Stage stage){

fruitVegList = new FruitVeg(); beverageList = new Beverages(); breadList = new Bread();

BorderPane root = new BorderPane(); Scene scene = new Scene(root, 750, 750);

GridPane grid = new GridPane(); grid.setPadding(new Insets(20,20,20,20)); grid.setHgap(10); grid.setVgap(10); ColumnConstraints column1 = new ColumnConstraints(50); ColumnConstraints column2 = new ColumnConstraints(200, 200, Double.MAX_VALUE); ColumnConstraints column3 = new ColumnConstraints(200, 200, Double.MAX_VALUE); column1.setHgrow(Priority.ALWAYS); column3.setHgrow(Priority.ALWAYS); grid.getColumnConstraints().addAll(column1, column2, column3); grid.setGridLinesVisible(true);

Text scenetitle = new Text("My Shopping List"); scenetitle.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20)); grid.add(scenetitle, 0, 0, 4, 1);

Label op1 = new Label("1."); op1.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20)); grid.add(op1, 0, 1);

comboBox = new ComboBox(); comboBox.getItems().addAll( "Fruits and Vegetables", "Beverages", "Bread"

); comboBox.setPromptText("Choose a department"); grid.add(comboBox, 1, 1);

Label op2 = new Label("2."); op2.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20)); grid.add(op2, 0, 2);

lv1 = new ListVie(); grid.add(tf1, 1, 2);

Label op3 = new Label("3."); op3.setFont(Font.font("Tahoma", FontWeight.NORMAL, 20)); grid.add(op3, 2, 2);

lv2 = new ListView(); grid.add(lv2, 3, 2);

comboBox.setOnAction(event -> {
comboBox.getSelectionModel().selectedItemProperty() .addListener((ObservableValue observable, Object oldvalue, Object newValue) -> { if (newValue == "Fruit and Vegetables") { tf1.setText(fruitVegList); } });

});

root.getChildren().addAll(grid);

stage.setTitle("MY SHOPPING LIST"); stage.setScene(scene); stage.show(); }

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

Fruit class

package grocerylist;

import java.util.List;

public class FruitVeg extends Groceries {

public FruitVeg(){ fruitVegList.add("Apple"); fruitVegList.add("Banana"); fruitVegList.add("Cucumber"); fruitVegList.add("Carrot"); fruitVegList.add("Kale"); fruitVegList.add("Salad"); fruitVegList.add("Pear");

}

public List<String> getFruit() { return fruitVegList; }

}

abstract class

package grocerylist;

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

public abstract class Groceries {

List<String> fruitVegList = new ArrayList<>();
}