如何在Java中制作二维LinkedList?

从您的问题来看，我认为(不是100％肯定) java.util.LinkedHashMap<K, V>

from your question, I think (not 100% sure) you are looking for java.util.LinkedHashMap<K, V>

在您的情况下为LinkedHashMap<String, Double>

来自Java文档:

Map接口的哈希表和链表实现，具有 可预测的迭代顺序.此实现不同于HashMap 因为它维护了遍历其所有列表的双向链表 项.

Hash table and linked list implementation of the Map interface, with predictable iteration order. This implementation differs from HashMap in that it maintains a doubly-linked list running through all of its entries.

如果您确实想通过list.get(5)获取元素，则可以:

if you do want to get element by list.get(5), you could :

LinkedList<Entry<String, Double>>

因此您可以通过Entry entry = list.get(5)获取Entry元素，然后entry.getKey()给您STRING，而entry.getValue()给您Double.

so you can get Entry element by Entry entry = list.get(5), then entry.getKey() gives you the STring, and entry.getValue() gives you the Double.