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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.State mode refers to allowing an object to change its behavior when its internal state changes. The object seems to have modified its class. Divide this sentence into two parts by commas. The first part means to encapsulate the state into a separate class and delegate the request to the current state object. When the internal state of the object changes, different behavior changes will be brought about. The second part is from the customer's point of view, the object used has completely different behaviors in different states. The object seems to be instantiated from different classes, but in fact this is the effect of using delegates.Linux/MacOS大军在函谷关下连续奋战数日，依旧难以推进，项羽不由的又急又怒。前世的他出身军队，全师格斗比试，年年都是前三名，再加上东来强壮的身体，即便人多又能怎地？尹旭毫不畏惧。　　《遍地黄金》：2003年沙士时期，大时代下三个小市民的发达白日梦。三人常胡扯投资大计，妄想一夜致富。一番进退争论后，总是错失发达机会。The influence of forging independence: forging independence takes pre-job independence as the benchmark value for inductance, and 214 as the benchmark value. When the naked independence of the character is less than 214, there is no difference between forging independence and growth independence.