HelloWorld

package com.rim.samples.device.helloworlddemo;import net.rim.device.api.ui.UiApplication;import net.rim.device.api.ui.container.MainScreen;import net.rim.device.api.ui.Field;import net.rim.device.api.ui.component.Dialog;import net.rim.device.api.ui.component.RichTextField;/** * This class extends the UiApplication class, providing a * graphical user interface. */public class HelloWorldDemo extends UiApplication{ /** * Entry point for application * @param args Command line arguments (not used) */ public static void main(String[] args) { // Create a new instance of the application and make the currently // running thread the application's event dispatch thread. HelloWorldDemo theApp = new HelloWorldDemo(); theApp.enterEventDispatcher(); } /** * Creates a new HelloWorldDemo object */ public HelloWorldDemo() { // Push a screen onto the UI stack for rendering. pushScreen(new HelloWorldScreen()); } }/** * A class extending the MainScreen class, which provides default standard * behavior for BlackBerry GUI applications. */final class HelloWorldScreen extends MainScreen{ /** * Creates a new HelloWorldScreen object */ HelloWorldScreen() { // Set the displayed title of the screen setTitle("Hello World Demo"); // Add a read only text field (RichTextField) to the screen. The // RichTextField is focusable by default. Here we provide a style // parameter to make the field non-focusable. add(new RichTextField("Hello World!", Field.NON_FOCUSABLE)); } /** * Displays a dialog box to the user with the text "Goodbye!" when the * application is closed. * * @see net.rim.device.api.ui.Screen#close() */ public void close() { // Display a farewell message before closing the application Dialog.alert("Goodbye!"); super.close(); } }