What do singletons, utility classes, and dependency injection have in common? All three worry about controlling instantiation - when, how, and by whom? Effective Java items 3, 4, and 5 have something to say about that.
Utilities, Singletons and Dependency Injection - Effective Java, Items 3-5
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Mildly surprising (to me), it makes sense to discuss these three patters in one video - so here it goes