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When LinkedHashMap.keySet() is called, will the order of the Set returned be the same as the order the keys were added in?
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A LinkedHashMap cannot contain duplicate keys. LinkedHashMap can have null values and the null key. Unlike HashMap, the iteration order of the elements in a LinkedHashMap is predictable.
A LinkedHashMap is the same as a HashMap , except that the LinkedHashMap maintains the insertion order, whereas the HashMap does not.
LinkedHashMap maintains insertion order. Convert LinkedHashMap into TreeMap and after that print keys of TreeMap which are sorted in nature.
HashMap does not maintains insertion order in java. Hashtable does not maintains insertion order in java. LinkedHashMap maintains insertion order in java. TreeMap is sorted by natural order of keys in java.
Yes.
See: LinkedHashMap:
This linked list defines the iteration ordering, which is normally the order in which keys were inserted into the map (insertion-order).
and from the HashMap#keySet documentation:
The set [returned] is backed by the map, so changes to the map are reflected in the set, and vice-versa.
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