Blackberry JAVA DEVELOPMENT ENVIRONMENT Panduan Memulai - Halaman 15

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6. Close the BlackBerry device application.

Code sample: A HelloWorld application

The following sample code pulls together the tasks in this section into an BlackBerry® device application that

displays the text 'Hello World!' on the BlackBerry smartphone screen and displays a dialog box with the text

'Goodbye!' when the BlackBerry device application closes.

/**

Example:

* HelloWorld.java

package com.rim.samples.helloworld;

import net.rim.device.api.ui.*;

import net.rim.device.api.ui.component.*;

import net.rim.device.api.ui.container.*;

import net.rim.device.api.system.*;

* BlackBerry device applications that provide a UI

* must extend the UiApplication class.

public class HelloWorld extends UiApplication

{

public static void main(String[] args)

{

//Create a new instance of the BlackBerry device pplication

//and start the BlackBerry device application on the event thread.

HelloWorld theApp = new HelloWorld();

theApp.enterEventDispatcher();

}

public HelloWorld()

{

//Display a new screen.

pushScreen(new HelloWorldScreen());

}

//Create a new screen that extends MainScreen and provides

//behaviour similar to that of other BlackBerry device applications.

final class HelloWorldScreen extends MainScreen

{

public HelloWorldScreen()

{

//Invoke the MainScreen constructor.

super();

//Add a title to the screen.

LabelField title = new LabelField("HelloWorld Sample", LabelField.ELLIPSIS

setTitle(title);

| LabelField.USE_ALL_WIDTH);

2: Create a basic BlackBerry device application