Return set of unique character from given string

distinct_char

String s = "hksaksaggah";//sample string
String temp2="";//string with no duplicates
HashMap<Integer, Character> tc = new HashMap<>();//create a hashmap to store the char's
char [] charArray = s.toCharArray();
for (Character c : charArray)//for each char
{
  if (!tc.containsValue(c))//if the char is not already in the hashmap
  {
    temp2=temp2+c.toString();//add the char to the output string
    tc.put(c.hashCode(),c);//and add the char to the hashmap
  }
}

System.out.println(temp2);//final string