javafx : ComboBox and Listview

1.Main.java

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.stage.Stage;
import javafx.scene.Parent;
import javafx.scene.Scene;


public class Main extends Application {
	@Override
	public void start(Stage primaryStage) {
		try {
			Parent root = FXMLLoader.load(getClass().getResource("Main.fxml"));
			Scene scene = new Scene(root,300,300);
			scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
			primaryStage.setScene(scene);
			primaryStage.show();
		} catch(Exception e) {
			e.printStackTrace();
		}
	}
	
	public static void main(String[] args) {
		launch(args);
	}
}

2.Main.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.ComboBox?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.ListView?>
<?import javafx.scene.layout.AnchorPane?>

<AnchorPane prefHeight="300.0" prefWidth="300.0" xmlns="http://javafx.com/javafx/9.0.1" xmlns:fx="http://javafx.com/fxml/1" fx:controller="application.MainController">
   <children>
      <ComboBox fx:id="combobox" layoutX="14.0" layoutY="42.0" onAction="#comboChange" prefHeight="41.0" prefWidth="152.0" promptText="Select Name" />
      <Label fx:id="combo_selected_item" alignment="CENTER" layoutX="14.0" layoutY="14.0" prefHeight="28.0" prefWidth="152.0" />
      <Button layoutX="14.0" layoutY="92.0" mnemonicParsing="false" onAction="#comboAddElement" text="Add New Items" />
      <ListView fx:id="listview" layoutX="10.0" layoutY="133.0" prefHeight="157.0" prefWidth="280.0" />
   </children>
</AnchorPane>

3.MainController.java

import java.net.URL;
import java.util.ResourceBundle;

import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.SelectionMode;

public class MainController implements Initializable{
	
	@FXML
	public Label combo_selected_item; 
	
	@FXML
	public ComboBox<String> combobox;
	ObservableList<String> list = (ObservableList<String>) FXCollections.observableArrayList("Fahim", "Nava", "Sabbir", "Prinka", "Mim");

	@FXML
	public ListView<String> listview;
	
	@Override
	public void initialize(URL arg0, ResourceBundle arg1) {
		combobox.setItems(list);
		listview.setItems(list);
		listview.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);
		
	}
	
	public void comboChange(ActionEvent event) {
		combo_selected_item.setText(combobox.getValue());
	}
	
	public void comboAddElement(ActionEvent event) {
		// Add item on combo box and listview
		
		//combobox.getItems().addAll("Tumpa", "Mithila","Afsana","Bristy");
		//listview.getItems().addAll("Tumpa", "Mithila","Afsana","Bristy");
		
		// Show All Selected Items from listview
		ObservableList<String> names;
		names =  listview.getSelectionModel().getSelectedItems();
		
		StringBuffer all_name = new StringBuffer();
		for(String name:names) {
			all_name.append(name);
		}
		combo_selected_item.setText(all_name.toString());
	}

}