Hello World in Java ME

Comments

13 Sep
2009

Article Review by vkmunjpara (20090913)

Best For Beginners

When you are getting started any language, the first step is to know how to print a simple line in the output screen. And in the programming world,the first line we print generally is "Hello World". And this article shows how you can start J2ME with a starting basic midlet.This article also explains the basic methods like startApp,pauseApp,etc...

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13 Sep
2009

Article Review by fasttrack (20090913)

Start from the base

Simple, with working code. Just copy&paste, but you should know a bit about programming in Java. And there's even a picture :)!

Article helps beginners to create application in Java ME. In most language programmer learn to create a program from the basic program like “Hello world” a simple print line. Using this use can understand that hoe many thing or header files are needed to run the application

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Article Metadata

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Compatibility

Platform(s): Series 40 and later Java Enabled phones

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Article

Created: tyborg (07 Jun 2007)

Last edited: hamishwillee (21 May 2013)

If we want to learn a new language, the first program is always the classical "Hello World!"

This program creates a new form with a string item and an exit button.

To install the tools needed for developing in Java ME for Nokia devices, see articles Getting started with Java ME, Getting started with Java ME], and Creating your first MIDlet using EclipseME.

Code for HelloWorldMidlet.java

package com.example.helloworld;
 
import javax.microedition.midlet.MIDlet;
import javax.microedition.lcdui.*;
 
public class HelloWorldMidlet extends MIDlet implements CommandListener {
 
    public HelloWorldMidlet() {
    }
    // Display
    private Display display;
    // Main form
    private Form form;
    // For the message
    private StringItem stringItem;
    // For the exit command
    private Command exitCommand;
 
    public void commandAction(Command command, Displayable displayable) {
        if (displayable == form) {
            if (command == exitCommand) {
                exitMIDlet();
            }
        }
    }
 
    public void startApp() {
        // Create form
        stringItem = new StringItem("Hello", "Hello World!");
        form = new Form(null, new Item[] {stringItem});
        exitCommand = new Command("Exit", Command.EXIT, 1);
        form.addCommand(exitCommand);
        form.setCommandListener(this);
 
        // Get display for drawning
        display = Display.getDisplay(this);        
        display.setCurrent(form);
    }
 
    // Your MIDlet should not call pauseApp(), only system will call this life-cycle method
    public void pauseApp() {
    }
 
    // Your MIDlet should not call destroyApp(), only system will call this life-cycle method    
    public void destroyApp(boolean unconditional) {
    }
 
    public void exitMIDlet() {
        display.setCurrent(null);
        notifyDestroyed();
    }
 
}

Output