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The fourth and second levels do not interfere with each other.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.如今正是反秦报仇的好机会，那殷通只会误事，范先生也这么说的，叔父您切勿再犹豫。跟将士们在虎王寨停了几天。离异的刘展鹏和丧偶的杜敏秋想要再婚，却遭遇了意想不到的阻力。先是展鹏的女儿茉莉为了让父母复合而进行各种破坏，接着是展鹏母亲刘兰芝对新儿媳妇诸多挑剔与不满，但最让敏秋头疼的还是展鹏和前妻江天蓝的藕断丝连。尽管展鹏赌咒发誓和天蓝接触只是因为女儿，敏秋也暗暗责怪自己太小气，但每次见到展鹏为天蓝的事操心，心里总不是滋味。在经历了一系列啼笑皆非的事件之后，展鹏和天蓝终于让敏秋明白，离婚后的夫妻不应该是仇人，因为他们早已经是亲人了。敏秋坦然接受了天蓝这个亲人，最终和展鹏迈进了婚姻的殿堂。正说着，在外面望风的一名军士跑了进来：黎指挥使，对面山上来一股敌人。怎么对敌人都如此窝囊。