SOLID PRINCIPLES

 Liskov Substitution Principle           is a fundamental SOLID principle that states " You should be able to use any derived class instead of a parent class and have it to behave in the same manner without modification". It ensures that a derived class does not affect the behaviour of the base class . Before going into implementation of LSP , please do go through the previous article on OCP . We are continuing with the same example . This article is divided into three parts :  - Banking Service without LSP  - Banking Service Example with LSP  - Conclusion And now business want to provide the Additional Compound Interest to Salary Accounts , so in our base abstract class we are now adding another method called CalculateCompundInterest . And our abstract class looks like this  and now the derived classes looks something like below and everything looks fine till there .  Now check the below code which  violate the LSP ...