To go into more depth this week, as a Friday project I designed and implemented an online store backend system in Java. 

Polymorphism, abstraction, inheritance - everything that belongs to object orientation was of course included. In addition, exceptions and optional types and user interactions were added. 

Check out the repo and feel free to give me a review. 

https://github.com/Haferkorn/ProductOrderSystem

Part of being a good programmer is theory and understanding how algorithms and data structures work under the hood. Of course, everyone can use them. After a long time of figuring things out, I rebuilt the LinkedList data structure in Java today and got to grips with the other DSs: 

- Maps,
- Trees,
- arrays
- lists
- queue 
- deque 

Today I studied the important paradigms of object-oriented programming.

- Polymorphism
- Abstraction 
- Inheritance 
 

This week is all about object oriented programming (OOP) in Java. 

Today we covered: 

• classes
• objects
• packages
• methodes
• access modifier (public/privat etc)
• overriding methods 

https://github.com/Haferkorn/JavaOOP

Today is all about control flow using TDD in Java. 

Analyzing a problem 
Write test 
Write method 
Test 
Merge

I finished the day using the CI system via maven in Github. Now it's time for testing.