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Factory Pattern: Factory Pattern is a frequently used pattern. Classes implemented according to Factory Pattern can generate instances of one of a group of classes according to the provided data. Usually, this group of classes has a common abstract parent class and implements the same methods, but these methods perform different operations for different data. First of all, we need to define a base class. Subclasses of this class implement methods in the base class through different methods. Then you need to define a factory class that can generate different subclass instances according to conditions. After getting an instance of a subclass, developers can call methods in the base class regardless of which subclass instance is returned.A2.4. 4 Vitiligo with small range of non-exposed parts is qualified.就是一群年轻人battle街舞的故事呀First of all, it needs an industry or field that has been reasonably developed. The routine of the whole industry has been clearly and deeply believed that if people cannot practice deliberately in the field of crossing the river by touching stones, blind guidance will easily occur. Without objective evaluation criteria, it is difficult to carry out deliberate practice. Gardening, chefs, consultants, teachers... cannot carry out deliberate practice.该剧以诚信为主题，带有喜剧元素，讲述了一个关于诚信的故事。围绕着两个家庭的两代人在家庭、工作、生活中所面对的一系列困惑和矛盾展开，讲述了当代年轻人与老年人在面对选择时的不同价值取向，引发了人们对社会上一些真善美与假恶丑现象的思辨与思考，发人深省。