java - How do I traverse a LinkedHashMap in order ({atrivial, isAsked == true}];

Question

How does one do an inorder traversal of this Java LinkedHashMap:

LinkedHashMap<String, Integer> map = new LinkedHashMap<String, Integer>();

ArrayList<String> fields = new ArrayList<String>();
for (String key: map.________)
  fields.add(key);

Thanks.

Answer 1

ループは必要ありません。単に呼び出すだけです

List<String> fields = new ArrayList<String>(map.keySet());

Answer 2

map.keySet() is probably what you're looking for.

From the docs of LinkedHashMap

This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map (insertion-order).

So YES, it does maintain the order of insertion, even after you enter a MILLION keys.