String remove duplicate method in java
public static void main(String[] args) {
        String result = removeDup("AAABBBCCC");
        System.out.println(result); // ABC
public static  String  removeDup( String  str) {
        String result = "";
        for (int i = 0; i < str.length(); i++)
            if (!result.contains("" + str.charAt(i)))
                result += "" + str.charAt(i);
        return result;
    }
}
