How to preserve insertion order in HashMap

Question

I m using a HashMap  When I iterate over the map  the data is returned in  often the same  random order  But the data was inserted in a specific order  and I need to preserve the insertion order  How can I do this

User · Answer

HashMap is unordered per the second line of the documentation      This class makes no guarantees as to the order of the map  in particular  it does not guarantee that the order will remain constant over time    Perhaps you can do as aix suggests and use a LinkedHashMap  or another ordered collection   This link can help you find the most appropriate collection to use

User · Answer

LinkedHashMap is precisely what you re looking for   It is exactly like HashMap  except that when you iterate over it  it presents the items in the insertion order

[java] How to preserve insertion order in HashMap?

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