/MyMIDlet.java/ package j2meprj;import javax.microedition.midlet.*; import javax.microedition.lcdui.*;public class MyMIDlet extends MIDlet private static MyMIDlet instance;private HelloWorldDisplay displayable = new HelloWorldDisplay();/* MIDlet 构造器 */public MyMIDlet() instance = this;/* MIDlet 启动方法 */public void startApp() Display.getDisplay(this).setCurrent(displayable);/* MIDlet 暂停方法 */public void pauseApp() /* MIDlet 摧毁方法 */public void destroyApp(boolean unconditional) /* 退出 MIDlet 方法 */public static void quitApp() instance.destroyApp(true);instance.notifyDestroyed();instance = null; /HelloWorldDisplay.java/ package j2meprj;import javax.microedition.lcdui.*;public class HelloWorldDisplayextends Canvasimplements CommandListener /* 构造器*/public HelloWorldDisplay() try jbInit();catch (Exception e) e.printStackTrace();public void paint(Graphics g) g.setColor(255, 255, 255);g.fillRect(0, 0, getWidth(), getHeight();g.setColor(0, 0, 0);g.drawString(“Hello World“, 50, 100, Font.SIZE_MEDIUM);/*组件初始化方法*/private void jbInit() throws Exception / 设置当前的显示类对象监听命令事件setCommandListener(this);/ 添加退出命令addCommand(new Command(“Exit“, Command.EXIT, 1);/*处理命令事件方法 */public void commandAction(Command command, Displayable displayable) /* 在此添加你的命令处理代码*/if (command.getCommandType() = Command.EXIT) / 调用 MIDlet 退出方法，退出 MIDletMyMIDlet.quitApp();