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The policy pattern defines a series of algorithms and encapsulates each algorithm so that they can be replaced with each other, and the changes in the algorithms will not affect the customers who use the algorithms. It is necessary to design an interface to provide a unified method for a series of implementation classes. Multiple implementation classes implement the interface, design an abstract class (optional, belonging to auxiliary class), and provide auxiliary functions. The diagram is as follows:2. In the above example, a set of state objects are created for each Context object. In fact, these state objects can be shared, and each Context object can share one state object. This is also one of the application scenarios of the meta-sharing mode3MDT Meeting Places and Facilities白起刚刚脱困，实力尚未恢复，而周青已经不再是当初那个菜鸟，而是天下少有的大宗师，现在又得到巫族传承，一身修为已经达到仙神一流。动画第二季播出在即，从4月开始到7月，每周三17点与日本同步更新小剧场。No. 31 Zhang Ruoyun　　同时，为创作出一部集思想性、艺术性和观赏性为一体的电视剧精品，《红军东征》剧组查阅了大量有关历史资料，并走访有关专家，深入到红军东征的实地吕梁地区进行深入研究调查，挖掘出了红军在此地弘扬革命民主及中华民族抗日统一战线的一系列事件。其中毛泽东享誉中外的诗词佳作《沁园春·雪》即是在革命时期的石楼所创作。剧中，除了勾勒出毛泽东、周恩来、彭德怀等中共领导人之外，以及一系列红军战士也进行了深刻的描绘和刻画，全面勾画出了一幅波澜壮阔的中国革命史诗。