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  1. import java.util.*;
  2.  
  3. class Tester
  4. {
  5. 	public static void main (String[] args)
  6. 	{
  7. 		Map map = new HashMap();
  8. 		map.put("key", "value");
  9. 		Set set = map.keySet();
  10. 		Object[] array = set.toArray(); //retrieve the array version of the key set
  11. 		System.out.println(Arrays.toString(array)); //print it
  12. 	}
  13. }
Success #stdin #stdout 0.07s 380224KB
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[key]
https://ideone.com/bYKyvo
language:
Java (HotSpot 12)
created:
9 years ago
visibility:
secret

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