Display information of Mobile Devices in J2ME application [Source Code]

import javax.microedition.lcdui.*;
import javax.microedition.midlet.MIDlet;

public class MobileProperties extends MIDlet implements CommandListener {

private Display display;
protected boolean started;
private Command exitCommand;

protected void startApp() {
if (!started) {
display = Display.getDisplay(this);
Canvas canvas = new DummyCanvas();

Form form = new Form("Attributes");
exitCommand = new Command("Exit", Command.EXIT, 0);
form.addCommand(exitCommand);

boolean isColor = display.isColor();
form.append(new StringItem(isColor ? "Colors: " : "Grays: ", String.valueOf(display.numColors())));
form.append(new StringItem("Width: ", String.valueOf(canvas.getWidth())));
form.append(new StringItem("Height: ", String.valueOf(canvas.getHeight())));
form.append(new StringItem("Pointer? ", String.valueOf(canvas.hasPointerEvents())));
form.append(new StringItem("Motion? ", String.valueOf(canvas.hasPointerMotionEvents())));
form.append(new StringItem("Repeat? ", String.valueOf(canvas.hasRepeatEvents())));
form.append(new StringItem("Buffered? ", String.valueOf(canvas.isDoubleBuffered())));

form.setCommandListener(this);
display.setCurrent(form);

started = true;
}
}

protected void pauseApp() {
}

protected void destroyApp(boolean unconditional) {
}

public void commandAction(Command c, Displayable d) {
if (c == exitCommand) {
notifyDestroyed();
}
}
}

class DummyCanvas extends Canvas {
protected void paint(Graphics g) {
}
}