Remove the same word from a list? | Java

I want to remove/ delete duplicate words. I tried this but it wont work.
Does someone have a solution for this?

    public static void main(String[] args) {
        List<String> words = sw("This is is an example");
        System.out.println(words); // => [an, example, is, This]
    }
    public static List<String> sw(String s) {
    List<String> words = new ArrayList<String>(Arrays.asList(s.trim().split(" +")));
    int size = words.size();
        for(int i = 0;i < size;i++) {
            for(int k = i+1;k < size;k++) { 
                if(size == 1) {
                    break;
                }
                if(k < size -1 && words.get(i).equals(words.get(k))) {  
                    words.remove(k);
                    k = k -1;
            }   if(size == 1) {
                break;
            }
                
         }
    }
        Collections.sort(words);
        return words;
}
}

>Solution :

this should be the solution 🙂

public static List<String> sw(String s) {
            List<String> words = new ArrayList<String>(Arrays.asList(s.trim().split(" +")));
            int size = words.size();
                for(int i = 0;i < size;i++) {
                    for(int k = i+1;k < size;k++) { 
                        if(k <= size -1 && words.get(i).equals(words.get(k))) {  
                        words.remove(k);
                        k--;
                        size--;
                    }   
                }
            }
            Collections.sort(words);
            return words;
        }
    }