Builder模式是一步一步创建一个复杂的对象,它允许用户可以只通过指定复杂对象的类型和内容就可以构建它们.用户不知道内部的具体构建细节-The Builder pattern is a step by step to create a complex object, which allows users to only by the type and content of the specified complex objects you can build them. Users do no