The Blackberry platform is Java® based, and there are number of different tools that you can
use to develop your applications. This tutorials only show basic programming for Blackberry® application. We assume that you’re not beginner in programming. Java® language is mandatory. This tutorials use Windows® OS, but you may develop use other OS.
Tools:

• Java® SE Development Kit (JDK)
  You can use version 5 or version 6. Version 6 is required if you are using BlackBerry® MDS-CS for debugging.
• Eclipse® IDE for Java® Developers
  The essential tools for any Java® developer, including a Java® IDE, a CVS client, XML Editor and Mylyn.
• BlackBerry® Java® Development Environment (JDEs)
  The BlackBerry® Java® Development Environment (BlackBerry JDE) is a fully integrated development environment and simulation tool for building Java Platform, Micro Edition (Java® ME) applications for Java® based BlackBerry® smartphones.
  It is a Mobile Information Device Profile (MIDP) compliant Java® ME environment for developers who wish to maintain seamless portability in their wireless applications. In addition, the BlackBerry® JDE provides a full suite of interfaces and utilities to take advantage of some of the unique features of the BlackBerry smartphone.
• BlackBerry® Eclipse™ Plug-in
  The BlackBerry® Web Development Plug-in for Eclipse™ allows developers to debug web-based applications and content for the BlackBerry solution.
  Working through the familiarity of Eclipse™ allows simplified code profiling and increases overall efficiencies. Users enjoy seamless integration with Eclipse™ 3.4, which allows comprehensive development of BlackBerry web applications and contents.
  The BlackBerry® Web Development Plug-in for Eclipse also facilitates active web development and debugging with a BlackBerry® Smartphone Simulator as well as active web profiling to optimize web projects.

Steps:

• Download JDK and Eclipse IDE for Java®.
  All the tools are absolutely free.
• Install Java® SE Development Kit (JDK)
• Install Eclipse™ IDE for Java® Developers
• Seting up Eclipse
  • Setup JDE Plug-in for Eclipse™ update site
    • From the Help menu, select Software Updates… to open the Software Updates and Add-ons window
    • Select the Available Software tab
    • Click the Add Site… button
    • In the Add Site dialog, type the URL http://www.blackberry.com/go/eclipseUpdate into the location text box
    • Click the OK button, BlackBerry Update Site appears in the Available Software list
    • Select the BlackBerry JDE Plug-in for Eclipse item and one BlackBerry Component Pack item you want to work on
    • Click the Install… button
    • Click the Next > button
    • Check I accept the terms of the license agreement radio button after reviewing licenses
    • Click the Finish button to begin installation
      Note: You’ll need to enter your BlackBerry® Developer Zone login ID and password in an authentication dialog. Due to security policy, you may be authenticated multiple times. If you don’t have a Developer Zone login, register for access to the BlackBerry Developer Community
    • After successfully downloading the files, you’ll be prompted to restart the Eclipse Platform. Choose to restart the platform
  • Further Reference: BlackBerry® JDE Plug-in for Eclipse™ Installation and Configuration by Mike Kirkup
• Write the code with Java® Languange
  • Setup New Project
    • Click on File/New/Project menu
    • Select BlackBerry/Blackberry Project
    • Click Next
    • Chose Project name and location
    • Enter the project name, i.e. “Hello World“
    • Select your location or use a default one to store your project
    • Click Finish
  • Configure your new BlackBerry project
    • Click on BlackBerry/Configure Blackberry Workspace
    • Click on the BlackBerry Workspace and insert your Vendor and Version data
    • Here you can change a number of different settings. Let’s just enter version number 1.0 and
      vendor “TestVendor”
    • From BlackBerry JDE, select Installed Components
    • Chose component package – 4.6.0 (Figure 6)
    • Click OK
  • Create a new HelloWorld Class
    • Click on File/New/Package
    • Enter the package path i.e. com.rim.samples.helloworld
    • Click on Finish button
    • Click on File/New/Class
    • Check the source folder and package. It should be Hello World/src and com.rim.samples.helloworld respectively
    • Enter HelloWorld as the name and click Finish
  • Implement a UiApplication
    • Type extends UiApplication after public class HelloWorld
    • Import the net.rim.device.api.ui by click on light bulb icon with red cross or by typing import net.rim.device.api.ui.UiApplication;
    • Create Method on Class HelloWorld
      public static void main(String[] args) {
      HelloWorld theApp = new HelloWorld();
      theApp.enterEventDispatcher();
      }
    • Create New Screen Object and Display it in the constructor
      public HelloWorld() {
      //display a new screen
      pushScreen(new HelloWorldScreen());
      }
  • Create HelloWorldScreen Class
    • add a HelloWorldScreen class which extends MainScreen:
      final class HelloWorldScreen extends MainScreen
    • Import net.rim.device.api.ui.container.MainScreen:
      import net.rim.device.api.ui.container.MainScreen;
      You can type the line or click on light bulb icon as described before
    • In the constructor of this class we will create LabelField title, to label our
      Application. Set the title and add a RichTextField with our message “Hello World!”. We also
      need to remember to import necessary packages as well as call MainScreen’s constructor
    • Import net.rim.device.api.ui.component.LabelField
    • Import net.rim.device.api.ui.component.RichTextField
    • add a small dialog which will appear when the user wants to exit the application. To
      do so we need to overwrite the onClose() method of the HelloWorldScreen class
    • Import net.rim.device.api.ui.component.Dialog
    • Import net.rim.device.api.ui.component.*
    • Final Source Code
      package com.rim.samples.helloworld;
      import net.rim.device.api.ui.UiApplication;
      import net.rim.device.api.ui.component.*;
      import net.rim.device.api.ui.container.MainScreen;
      public class HelloWorld extends UiApplication {
      public static void main(String[] args) {
      HelloWorld theApp = new HelloWorld();
      theApp.enterEventDispatcher();
      }
      public HelloWorld() {
      pushScreen(new HelloWorldScreen());
      }
      }
      final class HelloWorldScreen extends MainScreen {
      public HelloWorldScreen() {
      super();
      LabelField title = new LabelField(“HelloWorld Sample”,
      LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH);
      setTitle(title);
      add(new RichTextField(“Hello World!”));
      }
      public boolean onClose() {
      Dialog.alert(“Goodbye!”);
      System.exit(0);
      return true;
      }
      }
• Build and Run…
  • Click on Run/Run or the green shortcut icon on the toolbar
  • You can also choose to click Run/Debug, which will allow you to debug your application, but it also takes longer to load
  • When you get the simulator find and start your application from Downloads folder
  • When you run the application you should see our Hello World message
    
  • And when you click on exit button you will get the “Goodbye” dialog
  • To exit the simulator, just close its window

Reference:

• The BlackBerry® Developer Zone
• Tutorial for Blackberry® Developers
• Documentations for Blackberry® Developers