Learn the State Design Pattern

State is a behavioral design pattern that lets an object alter its behavior when its internal state changes. It appears as if the object changed its class.

State Design Pattern

UML Class Diagram

Not familiar with UML Class Diagram? I have written a detailed post on the UML Class diagram.

Implementation steps

Source Code Implementation

// Output
Order Confirmed!
Order Baked!Order Dispatched!Order Delivered Yeh!

When To Apply State Design Pattern

Pros of State Design Pattern

References

--

--

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store