Java tutorial
/* * To change this license header, choose License Headers in Project Properties. * To change this template file, choose Tools | Templates * and open the template in the editor. */ package com.save.area; import com.save.common.CommonComboBox; import com.save.service.AreaService; import com.save.area.serviceprovider.AreaServiceImpl; import com.vaadin.data.Property; import com.vaadin.ui.ComboBox; /** * * @author jetdario */ public class ProvincePropertyChangeListener implements ComboBox.ValueChangeListener { AreaService as = new AreaServiceImpl(); ComboBox city; public ProvincePropertyChangeListener(ComboBox city) { this.city = city; } @Override public void valueChange(Property.ValueChangeEvent event) { if (event.getProperty().getValue() == null) { } else { CommonComboBox.citiesByProvinceId((int) event.getProperty().getValue(), getCity()); } } ComboBox getCity() { return city; } }