Question

I need to convert a HashMap<String, Object> to an array; could anyone show me how it’s done?

Answer 1

hashMap.keySet().toArray(); // returns an array of keys
hashMap.values().toArray(); // returns an array of values

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Edit

It should be noted that the ordering of both arrays may not be the same,
See oxbow_lakes answer for a better approach for iteration when the pair key/values are needed.