remove duplicate words from string in java

import java.util.*;import java.lang.*;class Demo{    public static void main(String[] args){        String sen = "Sam went went to to to his business";        String[] arr = sen.split(" ");        //arr={Sam,went,went,to,to ,to ,his ,business};        Set<String> s = new LinkedHashSet<String>();        for(int i=0;i<arr.length;i++){            s.add(arr[i]);        }        for(String ss:s){            System.out.print(ss+" ");        }        System.out.println();    }   }