Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.programming > #3393

Re: Object oriented programming?

Show all headers | View raw

Kicer <a@b.c> wrote:
> root wrote:
> 
>> My programming experience began before the advent of Object Oriented
>> Programming so the concepts are vague to me. It would help if
>> someone could sketch out how OOP would enter into some of tasks
>> I have done.
>> 
>> I have written my own text editor, the general structure is:
>> 
>> Initialize stuff
>> read in any starting text
>> 
>> while(1)
>> display text
>> accept user command
>> process user command
>> 
>> If one were to use OOP concepts and start writing a new text
>> editor, how would objects change this picture?
>> 
> 
> You may search web for information about object oriented design.

I have done so, in fact I am watching a lecture series on the
subject. Examples in texts such as a payroll program are not
easily translated into the types of programs I have worked
on. My text editor example seems completely unrelated to a
payroll program.

> In short: you hide implementation behind interface.

OK, I take that the "hide" part is to hide how something is done
from the rest of the program, not from the user. I take that
as dictated more from a program maintenance standpoint than any
other reason.




> Example: your editor's engine should get constructed objects (look for 
> builder or factory patterns) as an abstract interface.

I don't understand what builder or factory patterns are.

> There should be at least 3 objects and 3 interfaces: one pair for display, 
> one for communication with user and one for command processor.

Well, how is this for the display pair, the object is the block of text
which can fit into the current display, and the display object is the screen?

Can I say that a user object is a string of characters defining
operations to be performed?

The command processor is the real stumbling block for me. I can parse the
user command string for a sequence of operations, but these operations
themselves seem to define objects unique to the operations. Sometimes
the operations work on characters, sometimes lines, sometimes on the
whole block of text.

> 
> As your engine will use abstract interfaces for this 3 roles and you can (in 
> your factory/builder) use various implementations and switch them according 
> to situation (text/graphical user interface (or a fake one - for testing)).
> 
> regards

Thanks for responding.
> 

Back to comp.programming | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Object oriented programming? root <NoEMail@home.org> - 2013-05-29 14:25 +0000
  Re: Object oriented programming? Melzzzzz <mel@zzzzz.com> - 2013-05-29 18:19 +0200
    Re: Object oriented programming? root <NoEMail@home.org> - 2013-05-30 13:51 +0000
      Re: Object oriented programming? Melzzzzz <mel@zzzzz.com> - 2013-05-30 19:48 +0200
  Re: Object oriented programming? Patricia Shanahan <pats@acm.org> - 2013-05-29 09:21 -0700
    Re: Object oriented programming? root <NoEMail@home.org> - 2013-05-30 13:56 +0000
  Re: Object oriented programming? James Harris <james.harris.1@gmail.com> - 2013-05-29 13:05 -0700
    Re: Object oriented programming? root <NoEMail@home.org> - 2013-05-30 14:07 +0000
      Re: Object oriented programming? "osmium" <r124c4u102@comcast.net> - 2013-05-30 10:49 -0500
      Re: Object oriented programming? James Harris <james.harris.1@gmail.com> - 2013-06-01 12:18 -0700
  Re: Object oriented programming? Kicer <a@b.c> - 2013-05-29 22:13 +0200
    Re: Object oriented programming? root <NoEMail@home.org> - 2013-05-30 14:22 +0000
      Re: Object oriented programming? Kicer <a@b.c> - 2013-06-01 02:54 +0200
        Re: Object oriented programming? Patricia Shanahan <pats@acm.org> - 2013-06-01 07:43 -0700
          Re: Object oriented programming? Kicer <a@b.c> - 2013-06-05 18:16 +0200
  Re: Object oriented programming? rugxulo@gmail.com - 2013-05-30 22:22 -0700
    Re: Object oriented programming? root <NoEMail@home.org> - 2013-05-31 14:05 +0000
      Re: Object oriented programming? "Charles Hottel" <chottel@earthlink.net> - 2013-05-31 12:12 -0400
        Re: Object oriented programming? root <NoEMail@home.org> - 2013-05-31 20:31 +0000
          Re: Object oriented programming? "BartC" <bc@freeuk.com> - 2013-06-01 00:59 +0100
  Re: Object oriented programming? Willem <willem@turtle.stack.nl> - 2013-06-01 07:54 +0000
    Re: Object oriented programming? Jongware <jongware@no-spam.plz> - 2013-06-07 11:05 +0200
  Re: Object oriented programming? Paul N <gw7rib@aol.com> - 2013-06-02 13:11 -0700
    Re: Object oriented programming? Daniel Pitts <newsgroup.nospam@virtualinfinity.net> - 2013-06-03 11:06 -0700

csiph-web