└── remove duplicates


/remove duplicates:
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 1 | import java.util.HashSet;
 2 | import java.util.Set;
 3 | 
 4 | public class Main {
 5 |     public static void main(String[] args) {
 6 |         String str = "Harshitha";
 7 |         System.out.println(removeDuplicates(str));
 8 |     }
 9 |     public static String removeDuplicates(String str) {
10 |         Set<Character> set = new HashSet<>();
11 |         StringBuffer sf = new StringBuffer();
12 |         for (int i = 0; i < str.length(); i++) {
13 |             Character c = str.charAt(i);
14 |             if (!set.contains(c)) {
15 |                 set.add(c);
16 |                 sf.append(c);
17 |             }
18 |         }
19 |         return sf.toString();
20 |     }
21 | }
22 | 


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