Components and Containers : My Notes

[Anonymous]

<font size=2>
                                            Component (Abstract) 
                                                |{Superclass of all non-menu related elements}
                                                |
                                                |
                                                |
                                            Container
                                                |
                                                |
   (Default Layout Manager : FlowLayout)        |    (Default LayoutManager for Window and Suclasses : BorderLayout)
                      +-------------------------+------------------------+
                      |                                                  |
                      |                                                  |
                      |                                                  |
                      |                                                  |
 (Not Top Level)    Panel  { Default Vibility is "true" for all       Window (Top Level)
  { No Title          |      components except for Window                |    
    No Border         |      and its sub-classes. It can be set          |     { Title - No
    No Menu }         |      using void setVisible(boolean b) }          |       Menu  - No
                      |                                                  |       Border- NO }
                      |                                                  |
                      |                                    +-------------+-----------+
                      |                                    |                         |
                      |                                    |                         |
              java.applet.Applet                           |                         |
                                                           |                         | 
                                                           |                         |
                                                         Frame                    Dialog             
                                 (Optionally resizeable, movable, Top Level) (Top Level, Optionally user-resizeable, movable)          
                                                  
                                                    { Title-bar - Yes          { Title-bar - Yes       
                                                      Meuns     - Yes            Menu-bar  - No        
                                                      icon      - Yes }          icon      - No }   
                                                
                                  {A Frame can contain several panels         Constructors
                                   which in turn can hold other GUI           ------------
                                   components and nested panels}               (Frame frame)
                                                                               (Frame frame, boolean modal)
                                   Constructors                                (Frame frame, String  Title)
                                   ------------                                (Frame frame, String  Title, boolean modal)
                                    ()   
                                    (String title)                             "modal" in a dialog denotes that all input 
                                                                                will be directed to its window until it is
                                                                                closed. Default: Non-modal
                           
All components use the font face ,background and foreground colors of their parent containers, unless explicitly set for the 
component.

Hope this helps
Shyam
[This message has been edited by Shyamsundar Gururaj (edited November 15, 2001).]

[Fei Ng]

hehehee... Shyamsundar , good work!!
How long did it take you to draw that?

[Anonymous]

Not too long Fei...It took me a good part of 30 minutes to do this
Shyam

[Anonymous]

This is based upon my studying with Khalid Mughal's book.

<font size=2>
                                           Menu-Component (Abstract) 
                                                |{Superclass of all menu-related classes}
                                                |
                                                |
                                                |
                      +-------------------------+------------------------+
                      |                                                  |
                      |                                                  |
                      |                                                  |
                      |                                                  |
                      |                                               MenuItem 
                      |                                                  |{ Defines a menu item that has a textual label.
                      |                                                  |  A keyboard shortcut can also be assigned for a 
                      |                                                  |  menu item }
                      |                                    +-------------+-----------+
                      |                                    |                         |
                      |                                    |                         |
                   MenuBar                                 |                         |
      {Implements a menu-bar that can contain              |                  CheckBoxMenuItem  
       pull-down menus.                                    |              {Implements a checkbox with a textual label            
                                                           |               that can appear in a menu.}          
       The pull-down menus are Menu objects.             Menu                      
       A menu-bar can be attached to a frame               |
       object.                                     {Implements a pull-down menu
                                                    that can appear in a menu-bar.
       An applet CANNOT have a menu-bar since              |
       it is not a sublclass of "Frame". }          A menu is a container of menu objects. 
                                                           |
                                                    Menus can be nested to create sub-menus.}  
                                                           |
                                                           |
                                                        PopupMenu
                                                   {Can be added to a component using the
                                                    add(PopupMenu popup) method defined in 
                                                    the Component class.
             
                                                    They CANNOT be contained in a menu-bar.
                                                     
                                                    They can be associated with any component (eg. canvas) }
                                                           
To Create a menu-bar for a frame...
1. Create a menu-bar ...........MenuBar menubar = new MenuBar();
2. Create a menu................Menu menu = new Menu("Title");
3. Create menu items and add them to the menu. The items appear from top to bottom in the order
   they were added. MenuItem objects(eg. CheckBoxMenuItem objects) and Menu objects(eg. sub-menus), separators can 
   be added to a menu.
   
   menu.add(new MenuItem("menuitem"));
   menu.add(Separator());
4. Add each menu to the menu-bar. ( The menus appear from left to right in the menu-bar in the order they were added)
   
   menubar.add(menu);
5. Add the menu-bar to a Frame.
   Frame frame = new Frame("Frame");
   frame.setMenuBar(menubar);

Hope this Helps
Shyam
[This message has been edited by Shyamsundar Gururaj (edited November 15, 2001).]

[Anonymous]

Hey Shyam,
That is great work. It's cool. Dude thanks for the help.
Regarding my exam, Not many days left. I am on it.
It's time for u to post your final few days preparation tips.
I appreciate it.

thanks
Chandra!
------------------
Where there is a Will, there is a Way.

[Malar Ravi]

Hi Shyamsundar, no doubt this is one of the best notes. Keep up this good work. If you find time, please do consider posting your notes on topics like I/O.
Thanks,
Malar.

[Vikrama Sanjeeva]

GREAT JOB Shyamsundar Gururaj!!.

Not too long Fei...It took me a good part of 30 minutes to do this

UR 30 Minutes has saved my almost half an hour as i am soon going for SCJP.UR Volounteer wprk is of gret wortyh 4 all Ranchers.
Bye.
Viki.

------------------
Count the flowers of ur garden,NOT the leafs which falls away!

[Maulin Vasavada]

good job Gururaj!
but i wonder if i want something like MenuBar in applet how do i do it if that is not supported?? though i still have to come up with an application which needs applet with menubar. can we find such requirement doing that??? this is just a "wild idea"!!
regards,
maulin