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与最强的使魔定下契约的ALTO，目标是成为伟大的魔法使“将魔导做到极致者白金广场”。However, for large-scale project development or framework design, it is obviously better to organize code with design patterns.? Mixing persistmon dye with blue dye?Data element: scheme://host: port/path Example: file://com.android.jony.test: 520/mnt/sdcard;展强眼神一缩，挥手令人将三人带走。咱们先不说这个，先准备会试要紧。The reason why the logic for creating an object is put into a separate class is that it can be used by multiple clients. And separates the creation and use of objects. However, this design also has many defects. First of all, SimpleFactory is a specific class, so we must program for the implementation, making the system lose its flexibility in this respect. Second, if we add new products, we have to modify the code in SimpleFactory, which violates the opening and closing principle. The above model is also called simple factory. He does not appear in GOF mode, it is more like a programming habit.