RemoveDuplicatesUsingSet.java

import java.util.HashSet;
import java.util.Iterator;

public class RemoveDuplicatesUsingSet {

    public static String removeDuplicates(String s){
        HashSet<Character> set = new HashSet<Character>();
        char [] chars = s.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            set.add(chars[i]);
        }
        Iterator<Character> iterator = set.iterator();
        String sbString = new String();
        while (iterator.hasNext())
            sbString += iterator.next()+"";

        return sbString;
    }
    public static void main(String[] args) {
        String s = "tutorialhorizon";
        System.out.println(removeDuplicates(s));
    }
}