This example shows how to hide text in a TextField. This is useful when the user enters his/her password.




 /*
J2ME: The Complete Reference

James Keogh

Publisher: McGraw-Hill

ISBN 0072227109

*/
//jad file (please verify the jar size)
/*
MIDlet-Name: HideText
MIDlet-Version: 1.0
MIDlet-Vendor: MyCompany
MIDlet-Jar-URL: HideText.jar
MIDlet-1: HideText, , HideText
MicroEdition-Configuration: CLDC-1.0
MicroEdition-Profile: MIDP-1.0
MIDlet-JAR-SIZE: 100

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

public class HideText extends MIDlet implements CommandListener
{
  private Display display;
  private Form form; 
  private Command submit; 
  private Command exit; 
  private TextField textfield; 
  public HideText()
  {
   display = Display.getDisplay(this);
   submit = new Command("Submit", Command.SCREEN, 1);
   exit = new Command("Exit", Command.EXIT, 1);
   textfield = new TextField("Password:", "", 30, TextField.ANY | TextField.PASSWORD);
   form = new Form("Enter Password");    
   form.addCommand(exit);
   form.addCommand(submit);    
   form.append(textfield);
   form.setCommandListener(this);   
  }
  public void startApp()
  {
   display.setCurrent(form);
  }
  public void pauseApp()
  { 
  }
  public void destroyApp(boolean unconditional)
  { 
  }
  public void commandAction(Command command, Displayable displayable)
  {
   if (command == submit)
   {
     textfield.setConstraints(TextField.ANY);
     textfield.setString("Thank you.");
     form.removeCommand(submit);
   }
   else if (command == exit)
   {
      destroyApp(false);
      notifyDestroyed();
   }
  }
}

 

 

 

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