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  1. /* package whatever; // don't place package name! */
  2. import java.util.*;
  3. import java.util.stream.*;
  4. import java.util.concurrent.atomic.AtomicInteger;
  5.  
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. public class Main
  9. {
  10. 	static Map<String, Integer> rooms = Map.of(
  11.         "Gower", 281,
  12.         "Usk", 291,
  13.         "Wye", 283,
  14.         "Bala", 282,
  15.         "Pen y Fan", 292,
  16.         "Llangorse", 290,
  17.         "Snowdon", 288,
  18.         "Taff", 296,
  19.         "Cadair Idris", 292
  20.     );
  21.  
  22. 	public static String[] getTopRoomsBooked(Map<String, Integer> rooms, int n) {
  23.  
  24. 	    // just for the row id in inner print
  25. 	    AtomicInteger id = new AtomicInteger(1);
  26.  
  27. 	    Comparator<Map.Entry<String, Integer>> byTime = Comparator.comparing(Map.Entry::getValue, Comparator.reverseOrder());
  28. 	    Comparator<Map.Entry<String, Integer>> byName = Comparator.comparing(Map.Entry::getKey);
  29.  
  30. 	    return rooms.entrySet().stream()
  31. 	                .sorted(byTime.thenComparing(byName))
  32. 	                .limit(n)
  33. 	    // inner print       
  34. 	                .peek(e -> System.out.printf("%d: %s %d%n", id.getAndIncrement(), e.getKey(), e.getValue())) 
  35. 	                .map(Map.Entry::getKey)
  36. 	                .collect(Collectors.toList())
  37. 	                .toArray(String[]::new);
  38. 	}
  39.  
  40.  
  41. 	public static void main (String[] args) throws java.lang.Exception
  42. 	{
  43. 		int[] arr = {1, 3, 5};
  44. 	    Arrays.stream(arr)
  45. 	          .forEach(a -> System.out.println("Top " + a + ":\n" 
  46. 	              + Arrays.toString(Main.getTopRoomsBooked(rooms, a)) 
  47. 	              + "\n======\n"
  48. 	    ));
  49. 	}
  50. }
Success #stdin #stdout 0.2s 38556KB
comments ()
stdin
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Standard input is empty
stdout
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1: Taff 296
Top 1:
[Taff]
======

1: Taff 296
2: Cadair Idris 292
3: Pen y Fan 292
Top 3:
[Taff, Cadair Idris, Pen y Fan]
======

1: Taff 296
2: Cadair Idris 292
3: Pen y Fan 292
4: Usk 291
5: Llangorse 290
Top 5:
[Taff, Cadair Idris, Pen y Fan, Usk, Llangorse]
======
https://ideone.com/nFlcNz
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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