login application in j2me

Here is the code for login application in J2ME..

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

public class LoginMidlet extends MIDlet implements CommandListener {
private Display display;
private TextField userName;
private TextField password;
private Form form;
private Command cancel;
private Command login;

public LoginMidlet() {
userName = new TextField("LoginID:", "", 10, TextField.ANY);
password = new TextField("Password:", "", 10, TextField.PASSWORD);
form = new Form("Sign in");
cancel = new Command("Cancel", Command.CANCEL, 2);
login = new Command("Login", Command.OK, 2);
}

public void startApp() {
display = Display.getDisplay(this);
form.append(userName);
form.append(password);
form.addCommand(cancel);
form.addCommand(login);
form.setCommandListener(this);
display.setCurrent(form);
}

public void pauseApp() {
}

public void destroyApp(boolean unconditional) {
notifyDestroyed();
}

public void validateUser(String name, String password) {
if (name.equals("qm") && password.equals("j2")) {
menu();
} else {
tryAgain();
}
}

public void menu() {
List services = new List("Choose one", Choice.EXCLUSIVE);
services.append("Check Mail", null);
services.append("Compose", null);
services.append("Addresses", null);
services.append("Options", null);
services.append("Sign Out", null);
display.setCurrent(services);
}

public void tryAgain() {
Alert error = new Alert("Login Incorrect", "Please try again", null, AlertType.ERROR);
error.setTimeout(Alert.FOREVER);
userName.setString("");
password.setString("");
display.setCurrent(error, form);
}

public void commandAction(Command c, Displayable d) {
String label = c.getLabel();
if(label.equals("Cancel")) {
destroyApp(true);
} else if(label.equals("Login")) {
validateUser(userName.getString(), password.getString());
}
}
}

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Different kinds of objects often have a certain amount in common with each other. Mountain bikes, road bikes, and tandem bikes, for example, all share the characteristics of bicycles (current speed, current pedal cadence, current gear). Yet each also defines additional features that make them different: tandem bicycles have two seats and two sets of handlebars; road bikes have drop handlebars; some mountain bikes have an additional chain ring, giving them a lower gear ratio.

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