DesignPatterns | one thing I 've learned during my time whilst

DesignPatterns is a Java library. DesignPatterns has no bugs, it has no vulnerabilities and it has low support. However DesignPatterns build file is not available. You can download it from GitHub.

If there's one thing I've learned during my time whilst at SAP, it would be that of the importance of design patterns. Consequently, I purchased Head First Design Patterns and have decided to work through this to enhance my knowledge of these design principles and become a better programmer! I've decided that I may as well document my progress here on GitHub, as well as having a central repository that I can retrieve my code from. Chapter One This chapter was the introduction to the book and was all about the strategy pattern. I learned that the strategy pattern is a great way to deal with the issue of maintaining object oriented code. For example, in this chapter we followed the project 'SimUDuck', where we created a base duck class that used behaviours to control whether a duck can quack or fly etc. We created each behaviour that we want to use and then we assign that when we instantiate an instance of an object that extends from the main Duck object. The benefit of this is not having to worry about overriding inherited methods or creating an instance of a method for each object that inherits from an interface. Chapter Two So I've finally gotten round to going through this book again. At last. This chapter was all about the observer pattern. Initially created our own classes to provide the functionality of the Observer pattern and then used the built-in java.util.Observable class. Basically, the observer pattern uses a subject and observer to push through notifications to observers. A bit like a subscription to a magazine. You subscribe to the magazine and then when a new issue comes out, this is delivered straight to you. The same principle applies in code using the observer pattern.