C++ Programming - OOPS Concepts - Discussion

Can we use any other class, other than singleton class?

Singleton used in the development of an application like public chat, cricket score.

Give more explanation for singleton class with clear example.

@Kalaivani.

Singleton class is one whose only one instance (object) can be created. The object is declared globally so that we can use it anywhere in the program.

But this should be avoided as per the fundamental principles like encapsulation or data hiding. Singleton class can also be created by using all static methods which require no instance to call a method.

Eg:-

In the case of an atm machine when we insert our card, an instance is created for our account and all the transactions are created using that single instance of that card.

Define singleton class?

The Singleton's purpose is to control object creation, limiting the number of obejcts to one only. Since there is only one Singleton instance, any instance fields of a Singleton will occur only once per class, just like static fields. Singletons often control access to resources such as database connections or sockets.

For example, if you have a license for only one connection for your database or your JDBC driver has trouble with multithreading, the Singleton makes sure that only one connection is made or that only one thread can access the connection at a time.

What is the different between the singleton class and virtual class?

Why virtual class not access through any class?

Not getting the meaning of Singleton. Please describe it clearly.

What is an abstract class?

Describe it.