为了执行可变的方法，新的 LinkedList 类作为一个内部不可变的链表的容器，如清单 5 所示。

To implement mutator methods, the new LinkedList class serves as a container for an internal, immutable list, as shown in Listing 5.

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对于大对象，紧凑指针链表胜出，因为反序测试无需访问保存在另一个容器中的值。

For big objects the compact pointer list wins because the reversal test doesn't need access to values stored in another container.

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