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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		Map<Integer, String> map = new HashMap<Integer, String>();
  14.  
  15. 		map.put( 0 , "abc" );
  16. 		map.put( 4 , "efg" );
  17. 		map.put( 1 , "hij" );
  18. 		map.put( 3 , "klm" );
  19. 		map.put( 2 , "npo" );
  20.  
  21. 		List<Integer> keyList = new ArrayList<Integer>(map.keySet());
  22. 		Collections.sort(keyList);
  23. 		System.out.println(keyList);
  24.  
  25. 		map = new TreeMap<Integer, String>();
  26. 		map.put( 0 , "abc" );
  27. 		map.put( 4 , "efg" );
  28. 		map.put( 1 , "hij" );
  29. 		map.put( 3 , "klm" );
  30. 		map.put( 2 , "npo" );
  31. 		keyList = new ArrayList<Integer>(map.keySet());
  32. 		System.out.println(keyList);
  33. 	}
  34. }
Success #stdin #stdout 0.07s 380160KB
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https://ideone.com/VdtIKk
http://q...content-available-to-author-only...e.jp/1378803665
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
secret

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