README.md

SingleResponsibilityPrinciple-Solution

In my previous project ( SingleResponsibilityPriciple-Problem) We saw a problem in hte design of the Order class. This class had to change depending on the type of the order ( CreditCard Order / Online Order / Cash Order)

Instead of creating the single class (called Order), we need to create multiple sub classes for each Order ( namely : CreditCardOrder,OnlineOrder,CashOrder)

Solution

Final design will be like :

public class CreditCardOrder : Order {}

public class OnlineOrder : Order {}

public class CashOrder : Order {}

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Order class will have a base function called 'Checkout' and this function takes different variant based on the type of the order ( namely : CreditCardOrder,OnlineOrder,CashOrder)

1

CreditCardOrder - deals with only Charging the card

2

OnlineOrder - deals with Reservation , Payment , Notification ( all these are a separate function to be injected to a particular class)

3

CashOrder - Can inherit the basic functionality of Order class

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Take a look at this code to understand this better.

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Finally, with the Implementation of Order class where we only have a base functionality, so we don't need to change the 'Order' class. If we have a new functionality where we have to handle new type of Order, we just need to create a new class and inherit from the base class called ' Order'