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  1. import java.util.Set;
  2. import java.util.HashSet;
  3.  
  4. class StringUtilities
  5. {
  6. 	public static void main(String[] args)
  7. 	{
  8.     	String test = "Banana";
  9.  
  10. 		System.out.println("Test string \"" + test + "\" with duplicates removed is: \"" + removeDuplicates(test) + "\"");
  11. 	}
  12.  
  13. 	public static String removeDuplicates(final String input) {
  14. 		Set<Character> knownCharacters = new HashSet<>(input.length());
  15.     	StringBuilder noDuplicates = new StringBuilder(input.length());
  16.  
  17. 	    for(char character : input.toCharArray()){
  18. 	        if(!knownCharacters.contains(character)){
  19. 	        	knownCharacters.add(character);
  20. 	            noDuplicates.append(character);
  21. 	        }
  22. 	    }
  23. 	    return noDuplicates.toString();
  24.     }
  25. }
Success #stdin #stdout 0.04s 4386816KB
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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/K9Ku2p
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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