J2ME GUI Controls - Command Button

J2ME Program for Command Button

import javax.microedition.lcdui.*;

import javax.microedition.midlet.*;

public class CommandExample extends MIDlet implements CommandListener{

  private Form form;

  private Display display;

  private Command ok, back, cancel, exit, help, item, screen, stop;

  public CommandExample(){

    form = new Form("Command Form");

    screen = new Command("SCREEN", Command.SCREEN, 1);

    back = new Command("BACK", Command.BACK, 2);

    cancel = new Command("CANCEL", Command.CANCEL, 3);

    ok = new Command("OK", Command.OK, 4);

    help = new Command("HELP", Command.HELP, 5);

    stop = new Command("STOP", Command.STOP, 6);

    exit = new Command("EXIT", Command.EXIT, 7);   

    item = new Command("ITEM", Command.ITEM, 8);

  }

  public void startApp(){

    display = Display.getDisplay(this);

    form.addCommand(screen);

    form.addCommand(back);

    form.addCommand(cancel);

    form.addCommand(ok);

    form.addCommand(help);

    form.addCommand(stop);

    form.addCommand(exit);

    form.addCommand(item);

    form.setCommandListener(this);

    display.setCurrent(form);

  }

  public void pauseApp(){}

  public void destroyApp(boolean destroy){

    notifyDestroyed();

  }

  public void backCom(){

    Alert back = new Alert("BACK Command",

    "Back Command Executed!", null, AlertType.INFO);

    back.setTimeout(5000);

    display.setCurrent(back, form);   

  }

  public void okCom(){

    Alert ok = new Alert("OK Command",

    "OK Command Executed!", null, AlertType.INFO);

    ok.setTimeout(5000);

    display.setCurrent(ok, form);   

  }

  public void cancelCom(){

    Alert cancel = new Alert("CANCEL Command",

    "Cancel Command Executed!", null, AlertType.INFO);

    cancel.setTimeout(5000);

    display.setCurrent(cancel, form);   

  }

  public void exitCom(){

    Alert exit = new Alert("EXIT Command",

    "Exit Command Executed!", null, AlertType.INFO);

    exit.setTimeout(5000);

    display.setCurrent(exit, form);   

  }

  public void commandAction(Command c, Displayable d)

{

    String label = c.getLabel();

    if(label.equals("BACK")){

      backCom();

    } else if(label.equals("OK")){

      okCom();

    } else if(label.equals("CANCEL")){

      cancelCom();

    } else if(label.equals("EXIT")){

      exitCom();

    }

  }

}

Output:-