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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.我这就通知田横，一同出兵……梁国现在有兵力将近十万人，可以调动的机动兵力就到达了七万多。小苞谷敬上高凡反复默看了几遍，都会背了，也没看出蹊跷来。按理说十几两对寻常百姓是笔大钱，对赵大人来说真的不过九牛一毛，可他还是心疼，干脆就当没听见。I am pushing countless nights into a dawn to sleep with you."I think so, But it was too late, I'm sitting here and I'm telling you, It is said in a straight-forward way, But when this happened, Basically between crackles, The company commander's military quality is so strong, Also see in the eye can't help, He saw that the three men could not be saved, I think he is also in a hurry, From behind, he grabbed a three-piece explosive cartridge, Unscrewed the back cover, pulled the lead and held it on his shoulder, just like the javelin thrower in the Olympics. He threw the cartridge sideways, He threw such a heavy thing so far away, It's almost farther than I threw a grenade, Because I don't know how many times the front of the position has been ploughed by artillery, Full of floating soil, It's very soft, So when the explosive cylinder landed, it was finally inserted obliquely on the ground. It was also impartially inserted in the most densely populated position of the group of strange dogs, Then the explosive barrel exploded, which was quite powerful. I felt that it was more powerful than a shell. The width of the whole position was completely covered by 10 meters in front of it. On the spot, the strange dogs that were still biting the body and rushing halfway were all killed. My military cap was blown off by the shock wave. "Wang Zeduan said.