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After executing the command to add rules, look at the INPUT chain again and find that the rules have been successfully "appended" to the end of the INPUT chain. Now, the first rule indicates to discard all messages from 192.168. 1.146 and the second rule indicates to accept all messages from 192.168. 1.146. What is the result? Practice shows true knowledge. I used the ping command to send a message to the 156 host again on the 146 host, and found that the ping still failed. It seems that the second rule did not take effect.If an application uses a large number of objects, and a large number of these objects cause a large storage overhead, it should be considered. Also, most of the states of the object are external states. If you delete the external states of the object, you can replace many groups of objects with relatively few shared objects, or you can consider using the meta-sharing mode.Greece: 5,000从收服李左车，举荐张耳这些事情上来看，韩信确实不是那么的安稳。The adapter mode converts the interface of a class into another interface representation expected by the client, in order to eliminate the compatibility problem of the class caused by interface mismatch. It is mainly divided into three categories: class adapter mode, object adapter mode and interface adapter mode. First, let's look at the adapter pattern of the class. First, let's look at the class diagram:上前搀扶大哥，探查伤情。