（ ）模式将一个复杂对象的构建与其表示分离，使得同样的构建过程可以创建不同的表示。以下（ ）情况适合选用该模式。
①抽象复杂对象的构建步骤
②基于构建过程的具体实现构建复杂对象的不同表示
③一个类仅有一个实例
④一个类的实例只能有几个不同状态组合中的一种
问题1选项
A.生成器（Builder）
B.工厂方法（Factory Method）
C.原型（Prototype）
D.单例（Singleton）
问题2选项
A.①②
B.②③
C.③④
D.①④
正确答案及解析
正确答案
解析
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