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For interface programming, a lot of changes that may occur in the system in the future can be isolated. Why? If the code is written for an interface, he can implement the interface with any new class through polymorphism. However, when the code uses a large number of specific classes, once new specific classes are added, the code must be changed. Violating the opening and closing principle.恩威并施，加强管理，或许可试试。何霆气得拍案大骂。Use the-j option to indicate the corresponding action when the "match condition" is met. The action specified in the above example is DROP. In the above example, when the source address of the message is 192.168. 1.146, the message is DROP (discarded).3. The ID card of the handling person (one copy of the front and back is stamped with the official seal)Positive bottom stack mode. The color information in each channel is investigated, and the underlying color is superimposed on the positive film. The principle is the same as the "subtractive principle" in the color mode. The color produced by this mixture is always darker than the original. If there is a positive film stack with black, only black will be produced. Mixing with white will not have any effect on the original color.Then see if the startup container is running: