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"That what, The main reason I'm saying this is that I know a lot about dogs, At least the common types on the market, As long as the "name has a surname", There is nothing I can't call, but the kind of dog that rushed up in the battle at that time was simply too fierce. I saw it in appearance, in limbs, it was indeed a dog, and its body structure echoed the characteristics of a dog. However, I have never seen it before, whether in books or with my own eyes. "Policy pattern refers to defining a series of algorithms and encapsulating them. However, policy pattern not only encapsulates algorithms, but also encapsulates a series of business rules. As long as these business rules have the same objectives, we can use policy pattern to encapsulate them."Do you like the barrage shooting strategy of many camps when ships become secondary beauty girls?"First broadcast: October 17, 2009How to Learn Design Patterns