datagrammidlet.java

j2me实例代码

package datagramSample;

import javax.microedition.lcdui.Choice;
import javax.microedition.lcdui.ChoiceGroup;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;

public class DatagramMIDlet extends MIDlet implements CommandListener {
	private static final String SERVER = "Server";

	private static final String CLIENT = "Client";

	private static final String[] names = { SERVER, CLIENT };

	private static Display display;

	private Form f;

	ChoiceGroup cg;

	private boolean isPaused;

	private Command exitCommand = new Command("Exit", Command.EXIT, 1);

	private Command startCommand = new Command("Start", Command.ITEM, 1);

	public DatagramMIDlet() {
		display = Display.getDisplay(this);
		f = new Form("Datagram Demo");
		cg = new ChoiceGroup("Please select peer", Choice.EXCLUSIVE, names,
				null);
		f.append(cg);
		f.addCommand(exitCommand);
		f.addCommand(startCommand);
		f.setCommandListener(this);
		display.setCurrent(f);
	}

	public static Display getDisplay() {
		return display;
	}

	public boolean isPaused() {
		return isPaused;
	}

	public void startApp() {
		isPaused = false;
	}

	public void pauseApp() {
		isPaused = true;
	}

	public void destroyApp(boolean unconditional) {
	}

	public void commandAction(Command c, Displayable s) {
		if (c == exitCommand) {
			destroyApp(true);
			notifyDestroyed();
		} else if (c == startCommand) {
			String name = cg.getString(cg.getSelectedIndex());
			if (name.equals(SERVER)) {
				Server server = new Server(this);
				server.start();
			} else {
				Client client = new Client(this);
				client.start();
			}
		}
	}
}