问题：
java新手，尝试动态填充嵌套hashmap的名称，我应该如何修改第10行
使结果与下面的结果一致，以便在嵌套的hashmap上执行操作；
或者名字不重要？
预期结果：

Node(A, tempA)
Node(B, tempB)
...
Node(Z, tempZ)

代码：

Note that there are blocks of code excluded in the middle, so to focus on the approach for the question above.

1  private Map<String, HashMap<String, Integer>> nodes = new HashMap<>();
2 
3  String [] letters = new String[26];
4      for (int i = 0; i <26; i++){
5          char temp = (char) (65 + i);
6          letters[i] = String.valueOf(temp);
7      }
8
9  for (int i = 0; i < 26; i++){
10    HashMap<String, Integer> tempA = new HashMap<>();
11    nodes.put(letters[i], tempA);
12 }