Object Orientation: Observer Pattern
The observer pattern is a simple yet quintessential design pattern in object oriented programming. As programs become larger, objects multiply quickly, as do the interactions between them. For example, a class instance can be contained as an attribute in another class (composition), or be used by some method in another class (association). Sometimes these class relations are very simple and can be used without a second thought. But let’s assume you have some class containing mutable …
Object Orientation: Strategy Pattern
In object-oriented programming classes tend to multiply quickly. Luckily, some design patterns are available to solve commonly occurring issues. In this post I want to quickly illustrate the strategy pattern with an easy example written in Java. To make it intuitively clear why this pattern is called the ‘strategy’ pattern, let’s sketch a situation in which the application of different strategies is important: a game. Without getting lost in the philosophical details of what …
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