Consider the following singly linked implementation of the LinkedList class, with a dangling composite.
考虑下面linkedlist类的单连接执行，它有一个悬挂复合类型。
Because LinkedList isn't new, let's look at the new PriorityQueue class.
因为LinkedList不是新事物，所以我们来看一下新的priorityqueue类。
To implement mutator methods, the new LinkedList class serves as a container for an internal, immutable list, as shown in Listing 5.
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。
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