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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		Random r = new Random();
  10. 		int[] crr_array = new int[20];
  11.  
  12. 		for(int i = 0; i < 20; i++)
  13. 		{
  14. 			crr_array[i] = r.nextInt(10) + 1;
  15. 		}
  16.  
  17. 		HashMap<Integer, Integer> repetitions = new HashMap<Integer, Integer>();
  18.  
  19. 		for (int i = 0; i < crr_array.length; ++i) {
  20. 		  int item = crr_array[i];
  21.  
  22. 		  if (repetitions.containsKey(item))
  23. 		      repetitions.put(item, repetitions.get(item) + 1);
  24. 		  else
  25. 		      repetitions.put(item, 1);
  26. 		}
  27.  
  28. 		StringBuilder sb = new StringBuilder();
  29.  
  30. 		int overAllCount = 0;
  31.  
  32. 		for (Map.Entry<Integer, Integer> e : repetitions.entrySet()) {
  33. 		  if (e.getValue() > 0) {
  34. 		      overAllCount += 1;
  35.  
  36. 		      sb.append("\n");
  37. 		      sb.append(e.getKey());
  38. 		      sb.append(": ");
  39. 		      sb.append(e.getValue());
  40. 		      sb.append(" times");
  41. 		  }
  42. 		}
  43.  
  44. 		if (overAllCount > 0) {
  45. 		  sb.insert(0, " repeated numbers:");
  46. 		  sb.insert(0, overAllCount);
  47. 		  sb.insert(0, "There are ");
  48. 		}
  49.  
  50. 		System.out.print(sb.toString());
  51. 	}
  52. }
Success #stdin #stdout 0.04s 711168KB
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stdin
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Standard input is empty
stdout
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There are 9 repeated numbers:
1: 2 times
2: 2 times
3: 4 times
4: 2 times
5: 1 times
7: 3 times
8: 1 times
9: 3 times
10: 2 times
https://ideone.com/8NqXJx
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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