Regarding: "is A" And "has A" Relationship

[Thennam Pandian]

Hi,

I have seen a class has "is a" and "has a" relationship with one class. Is that a correct design? If it is correct, let me know the advantage of that design? On what scenario, we need to use this design?

The skeleton of the code :

Class A
{
  public void doSomeAction()  {}
}

Class B extends A
{ 
  private A obj;
 
  public void doSomeAction()  
  {
    obj.doSomeAction();
  }
}

[Jimmy Clark]

In the subject line, what does "Reg" mean?

Object-oriented designs should be based on domain/business requirements. In order to judge if a design is "efficient" or "not efficient", one would need to first read and understand the requirements. In software design there never is "correct" or "incorrect", as there are always many different styles and techniques which can be used to implement a particular requirement.

[Thennam Pandian]

Hi,

Thanks for your reply.

Reg in subject line means "Regarding".

[Jimmy Clark]

Thank you for explaining what you intended "Reg" to mean in your subject line.

Note , "Reg" is not an English word and your personal shorthand may not be understood. It is better to write with
real words instead of assuming that personal shorthand is understandable.

[Jan Cumps]

Moderator adapted title.