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.etest.common; import com.etest.service.CurriculumService; import com.etest.service.SyllabusService; import com.etest.serviceprovider.CurriculumServiceImpl; import com.etest.serviceprovider.SyllabusServiceImpl; import com.vaadin.data.Property; import com.vaadin.ui.ComboBox; import java.lang.reflect.Field; /** * * @author jetdario */ public class CurriculumPropertyChangeListener extends ComboBox implements Property.ValueChangeListener { CurriculumService cs = new CurriculumServiceImpl(); SyllabusService ss = new SyllabusServiceImpl(); private ComboBox topic; private int curriculumId; public CurriculumPropertyChangeListener(ComboBox topic) { this.topic = topic; } ComboBox getTopic() { return topic; } @Override public void valueChange(Property.ValueChangeEvent event) { if (event.getProperty().getValue() == null) { } else { CommonCascadeComboBox.getTopicFromCurriculum(getTopic(), (int) event.getProperty().getValue()); } } }