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Law of Demeter (LoD) is also called Least Knowledge Principle (LKP), which means that an object should know as little as possible about other objects. In other words, a module or object should interact with other entities as little as possible, making the system functional modules relatively independent, so that when a module is modified, the fewer modules will be affected and the easier it will be to expand.该走的，该走的，留在这个家里，也没什么出息。Abstract class or interface. Then program based on abstract classes or interfaces冒顿渐渐地有些心神不宁，除了太原攻城没有进展之外，还有一个关键之处，那就是左右贤王都没有及时送来军报。Let's look at another example of broadcasting. A program has 5 characters. After receiving the broadcasting message, it uses the stamp to draw the shape flower pattern.　　新一代青春剧《彩虹罗曼史》从失去双亲，相依为命的三个孩子讲起。通过接近真实的角色塑造，希望能引起观众共鸣，并把健康微笑献给观众。结合现实角色和不脱离大学的生活状态，认真表现社会现实。