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　　徐栋虽然被捕，但警方却找不到徐栋杀人的直接证据，而徐栋又是当地政The policy mode is the packaging of the algorithm, which separates the responsibility of using the algorithm from the algorithm itself and delegates it to different objects. Policy patterns usually wrap a series of algorithms into a series of policy classes. To encapsulate the policy pattern in one sentence is to "encapsulate each algorithm into a different policy class so that they can be interchanged". The following is the structure diagram of the policy mode:DoSth d1=new DoSth (Say);"Lecture Room" 20160304 Poetry Love 1 Beauty Difficult to Get Again1927年对共产党来说是血雨腥风的一年。在不到半年的时间内，中共中央两次被迫迁移。第一次是从上海迁往武汉，第二次则是从武汉迁回上海。两次迁移，都是因为猝不及防地遭到过去的盟友国民党的突然袭击。 　　中共武装反蒋后把中央领导机关秘密建立在上海。首先是因为中共没有稳定的根据地，只能选择在群众基础较好的大上海；其次是因为上海有租界，租界区华洋杂居、政出多门，各种势力矛盾重重，且租界区不查户口、交通便利。在租界区，国民党的警察、宪兵和特务不能随便执行“公务”，更不能开枪、捕人。租界巡捕房捉到共产党，国民党当局只能通过法律程序进行“引渡”。“国中之国”的这种特性正好可以加以利用，寻找掩护的职业和场所，设立党的机关，进行秘密活动。 　　在这种错综复杂、暗流涌动的大历史背景下，如何有效地保卫处于秘密状态下的首脑机关，成为中共中央一切工作重中之重。于是，由周恩来首倡，在原中央军委特务工作处的基础上，筹建了“中央特科”这个政治保卫机构。 　　电视连续剧《江南锄奸》正是以此为背景，表现了那个年代中共特科在党There was an analogy before, Each "chain" is a "checkpoint", Every message passing through this "level" must match the rules on this level. If there is a match, The message is processed correspondingly, For example, you and I are like two "messages" at the moment. Both of you and I are going to enter the customs at this moment. But the duke has a life, Only the imposing person can enter the customs, Those who do not meet this requirement are not allowed to enter the customs. So the soldiers guarding the customs followed the "rules" formulated by the duke. I began to look at you and me. In the end, you entered the customs smoothly, and I was rejected. Because you met the standard of "dignity", you were "released", while I did not meet the standard, so I was not released. In fact, "dignity" is a kind of "matching condition", "release" is a kind of "action", and "matching condition" and "action" form the rules.