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

public class Screen extends MIDlet implements CommandListener {

 private Command exitMidlet;
 private Command PerexodTextBox;
 private Command PerexodList;
 private Command PerexodAlert;
 
 private Display mydisplay;
 
 /* Constructor */
 public Screen() {
  mydisplay=Display.getDisplay(this);
  exitMidlet=new Command("Exit",Command.EXIT,1);
  PerexodTextBox=new Command("Next",Command.SCREEN,2);
 }

 public void startApp() {
  Form myform=new Form("This is Form");
  myform.addCommand(exitMidlet);
  myform.addCommand(PerexodTextBox);
  myform.setCommandListener(this);
  mydisplay.setCurrent(myform);
 }

 public void pauseApp() {
 }

 public void destroyApp(boolean unconditional) {
 }

 public void commandAction(Command c, Displayable d) {
  if (c==exitMidlet) {
   destroyApp(false);
   notifyDestroyed();
  }
  
  if (c==PerexodTextBox) {
   TextBox tb=new TextBox("TextBox", "TextBox is here",100,0);
   PerexodList=new Command("Next",Command.SCREEN,2);
   tb.addCommand(exitMidlet);
   tb.addCommand(PerexodList);
   tb.setCommandListener(this);
   Display.getDisplay(this).setCurrent(tb);
  }
  
  if (c==PerexodList) {
   List mylist=new List("List",List.IMPLICIT);
   PerexodAlert=new Command("Next",Command.SCREEN,2);
   mylist.addCommand(exitMidlet);
   mylist.addCommand(PerexodAlert);
   mylist.setCommandListener(this);
   Display.getDisplay(this).setCurrent(mylist);
  }

  if (c==PerexodAlert) {
   Alert myalert=new Alert("Alert","End",null,null);
   Display.getDisplay(this).setCurrent(myalert);
  }
 }
}