这两者都体现了延迟初始化的特性(因此又被称为futures)。前者是一个类，而后者则是一个轻量的，但并非“绝对”线程安全的结构。
Both support the idea of deferred initialization, also known as futures, the former is a class and the later a lightweight and slightly less safe structure.
这两者都体现了延迟初始化的特性(因此又被称为futures)。前者是一个类，而后者则是一个轻量的，但并非“绝对”线程安全的结构。
Both support the idea of deferred initialization, also known as futures, the former is a class and the later a lightweight and slightly less safe structure.
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