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如果一个程序只包含固定数量的对象且对象的生命周期都是已知的，那么这是一个非常简单的程序。编程痛点通常程序总是根据运行时才知道某些条件,从而去创建新的对象。在此之前，无法知道所需对象的数量甚至确切类型。解决方案需要在任意时刻和任意位置创建任意数量的对象。因此，不能再简单地这样依靠创建命名的引用来持有每...

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