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  1. import java.util.Set;
  2. import java.util.HashSet;
  3.  
  4. //Store in a file `StringUtilities.java`
  5. class StringUtilities
  6. {
  7.  
  8. 	public static void main(String[] args)
  9.     {
  10. 	    String test = "Banana";
  11.  
  12. 	    System.out.println("Test string \"" + test + "\" with duplicates removed is: \"" + removeDuplicates(test) + "\"");
  13.     }
  14.  
  15. 	public static String removeDuplicates(final String input) {
  16. 		Set<Character> knownCharacters = new HashSet<>(input.length(), 1.0f);
  17.     	StringBuilder noDuplicates = new StringBuilder(input.length());
  18.  
  19. 	    for(char character : input.toCharArray()){
  20. 	        if(knownCharacters.add(character)){
  21. 	            noDuplicates.append(character);
  22. 	        }
  23. 	    }
  24. 	    return noDuplicates.toString();
  25.     }
  26. }
Success #stdin #stdout 0.07s 2841600KB
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stdin
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Standard input is empty
stdout
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Test string "Banana" with duplicates removed is: "Ban"
https://ideone.com/welRit
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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