자바 LinkedHashSet의 반복 문자열을 사용하여 제거

import java.util.*;
public class Main{
    public static void main(String []args){
        LinkedHashSet<String>lset=new LinkedHashSet<String>();
        Scanner sc=new Scanner(System.in);
        String str=sc.nextLine();
            for(int i=0;i<str.length();++i){
                lset.add(String.valueOf(str.charAt(i)));
            }
            //String str1 = null;
            StringBuilder stb=new StringBuilder();
            for(String str2:lset){
                stb.append(str2);
                //System.out.println(str2);
            }
            System.out.println(stb.toString());
        }
   
}