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  Other Object Oriented Issues

Other Object Oriented Issue

Dynamic Binding

Binding  refers to linking of a procedure call to to the  code to be executed in response to the call. And the dynamic binding means that the data is  not bound to the  variable  until run time  and therefore no conflicts occur  during  compilation. When the source is complied the  value used to declare a pointer ( usually a base class) is used to resolve  that  pointer. This mean that the code associated with  a given  procedure call is  not known. Until  the time  of the call at run time. It is associated with polymorphism and inheritance.

Function Overriding

The function  overriding  of object oriented  approach  allows  function  with the  same  name  and parameters present  in base class and  derived class. The  issue of which  function  will be  called is decided  at run  time. This functionality eliminates the  need to name all the function  differently as there no conflict in calling the  function.

For example  consider  a case in C++ when both  the base  class and derived  class  base {

                --------

                ---------

Display ()

                            {

                            Count <<this  is the base class"

                            }

-----------

----------

                                    }

                                    Class derived 1 : base 1

'                                   {

                                    Display ()

                                                            {

                                                            Cout << This is the derived class"

                                    Void main ()

                                                {

                                    Derived 1 d:

                                                            D display ():

                                                }

Output:

So  here display  () is present twice but  only the  function present in the derived class is called  as the function

The issue of which  function will  be called  is resolved at run  time  as dynamic  binding  takes place.

Operator Overloading

OO approach allows a highly successful  feature  called operator overloading which  allows  the operators like '+'-'×' etc.  To be given a specific  meaning in  terms of objects. For  example  in making  a program  to concatenate two  strings  we can overload + operator. So  that it  means concatenation of two strings.

S3+  S2+ S1

This code will tell the  complier to concatenate string 1 with  string 2and put  the result  in S3.

Message Communication

Message  is a unit  of inter object communication mainly responsible  for completion of  tasks and ensures that all  the integrity constraints  are satisfied. It combines both  data flow  within a single entity.

1239_Message Homework Help.jpg

Type of Message

There are five  main types of message

1. Simple Message

2. Synchronous Message

3. Rendezuous Message

4. Timed Message

5. Asynchronous message

Objects are determined by underlining  each noun class and entering it in a  table. If the  objects  are required to implement  a solution then it part of the solution  space. These objects can be:

  • External Entities - that produce or consume information to be used by a computer based system.
  • Thing - that are part of the information domain for the problem.
  • Occurrence----- that occur within the context of a system operation.
  • Roles - played by people who interact with the system.
  • Organization units - that are relevant to an application.
  • Places - that establish the context of the problem and the overall function of system.
  • Structures - that define  as class  of objects or in the extreme.  Related classes of  objects.

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