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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. 	        String[] samples = {"tommy", "cannot", "solution"};
  13.  
  14. 	        Map<Character, Integer> charCountMap = new HashMap<Character, Integer>();
  15. 	        List<Character> seenSoFar = new ArrayList<Character>();
  16. 	        String first = samples[0];
  17. 	        for (Character c : first.toCharArray()) {
  18. 	            if (seenSoFar.contains(c)) {
  19. 	                continue;
  20. 	            }
  21. 	            else {
  22. 	                seenSoFar.add(c);
  23. 	                charCountMap.put(c, 1);
  24. 	            }
  25. 	        }
  26.  
  27. 	        for (int i = 1; i < samples.length; i++) {
  28. 	            seenSoFar = new ArrayList<Character>();
  29. 	            String s = samples[i];
  30. 	            for (Character c : s.toCharArray()) {
  31. 	                if (seenSoFar.contains(c)) {
  32. 	                    continue;
  33. 	                }
  34. 	                else {
  35. 	                    seenSoFar.add(c);
  36. 	                    if (charCountMap.keySet().contains(c)) {
  37. 	                        Integer j = charCountMap.get(c);
  38. 	                        j++;
  39. 	                        charCountMap.put(c, j);
  40. 	                    }
  41. 	                    else {
  42. 	                        // character is not in every string
  43. 	                    }
  44. 	                }
  45. 	            }
  46. 	        }
  47.  
  48. 	        List<Character> commonToAll = new ArrayList<Character>();
  49. 	        for (Character c : charCountMap.keySet()) {
  50. 	            Integer charWasSeenCount = charCountMap.get(c);
  51. 	            if (charWasSeenCount == samples.length) {
  52. 	                commonToAll.add(c);
  53. 	            }
  54. 	        }
  55.  
  56. 	        System.out.println("The following characters were found in every string examined:");
  57. 	        for (Character c : commonToAll) {
  58. 	            System.out.print(c + " ");
  59. 	        }
  60. 	        System.out.println("");
  61. 	}
  62. }
Success #stdin #stdout 0.04s 4386816KB
comments (?)
stdin 
Standard input is empty
stdout 
The following characters were found in every string examined:
t o
https://ideone.com/WYZell
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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