list .implicitمشكله فى

قم بانشاء ال List وقم بعمل اسلوب لتتم معرفة ما تم اختياره

String[] elements = {"Red","Yellow","Green" }; //Menu items as List elements
List menuList = new List("Choices", List.IMPLICIT, elements, null);
whatSelected(List list );

private void whatSelected( List list ) 
  {
    String selected = new String();
    for ( int i = 0; i < list.size(); i++ )
      if ( list.isSelected( i ) )
        selected = selected + " , " + list.getString( i );
     Alert alert = new Alert("choices");
     if ( selected.length() > 0 )
        alert.setString(" you selected : " + selected);
     else
        alert.setString("you didn`t select");
     display.setCurrent(alert);
  }