how to get unordered key value pair

The problem is that ;开发者_如何学Go I am retrieving a key value data object pair from database it is like

(select * from xyz ORDER BY letter DESC)

3 z,
2 y,
1 x

And Im putting these to a Long, String HashMap pair. The problem is when I putting these to Map pair, the order is changing. It appears as

1 x,
2 y,
3 z 

How can i preserve data as in first situation.

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Use a LinkedHashMap instead! That will keep the order.

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You can use LinkedHashMap

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use LinkedHashMap instead of HashMap. the order would be preserved.

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Use TreeMap instead of HashMap.

Some map implementations, like the TreeMap class, make specific guarantees as to their order; others, like the HashMap class, do not.

• from http://download.oracle.com/javase/6/docs/api/java/util/Map.html