Find All duplicates in a string

import java.util.Set;
import java.util.HashSet;

public class StringUtils{

 public static void main(String args[]){
   String input="testtest";
   char[] inputCharArray = input.toCharArray();
   Set charSet = new HashSet();
   int duplicatesCount=0;
   for(Character ch: inputCharArray){
   System.out.println("No of Duplicates in the string is " + duplicatesCount);

Time complexity is O(n)


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