what is the difference between inheritance and a class object.

The object is for reusability. (reuse the class member anywhere in the application.)

The inheritance is for an extension. (Extend the parent class methods in child class)

According to OCP (Open closed principle), a class should always be close for modification but must be open for extension, obviously, it is all about polymorphism but it is only the child class that extends the parent methods.

For me, polymorphism is the biggest gift to us, given by OOP but polymorphism and inheritance are connected.

If our parent class objects are able to replace a child class object at run time, then there is polymorphism with inheritance,

Loosely coupled architecture is not possible without polymorphism and inheritance.

Just like factory patterns with the interface are used to achieve loose coupling between layers, there is a role of inheritance in all of these.

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Sachin Singh5y ago
The object is for reusability. (reuse the class member anywhere in the application.)
The inheritance is for an extension. (Extend the parent class methods in child class)

According to OCP (Open closed principle), a class should always be close for modification but must be open for extension, obviously, it is all about polymorphism but it is only the child class that extends the parent methods.
For me, polymorphism is the biggest gift to us, given by OOP but polymorphism and inheritance are connected.

If our parent class objects are able to replace a child class object at run time, then there is polymorphism with inheritance,
Loosely coupled architecture is not possible without polymorphism and inheritance.
Just like factory patterns with the interface are used to achieve loose coupling between layers, there is a role of inheritance in all of these.