Given an array of Strings, return the number of sets of anagrams

Please review my code:

public class Anagram {

    public static void main(String args[]) {
        String[] arr = { "abc", "cbc", "bcc", "dog", "god", "mary", "army",
                "rty" };
        HashMap<Integer, List<String>> mapList = new HashMap<Integer, List<String>>();

        for (int i = 0; i < arr.length; i++) {
            int hashcode = gethashcode(arr[i]);

            if (mapList != null && mapList.get(hashcode) == null) {
                List<String> list = new ArrayList<String>();
                mapList.put(hashcode, list);
                list.add(arr[i]);
            } else {
                List<String> list = mapList.get(hashcode);
                list.add(arr[i]);
            }
        }

        printMap(mapList);

        System.out.println("Count=" + mapList.size());
    }

    private static void printMap(HashMap<Integer, List<String>> mapList) {

        if (mapList != null && mapList.size() > 0) {
            for (Integer key : mapList.keySet()) {
                List<String> list = mapList.get(key);

                System.out.print("[");
                if (list != null && list.size() > 0) {
                    for (int k = 0; k < list.size(); k++) {
                        System.out.print(list.get(k) + " ");
                    }
                }
                System.out.print("]");
            }
        }

    }

    private static int gethashcode(String str) {
        int hashcode = 0;
        char ch[] = str.toCharArray();

        for (int i = 0; i < ch.length; i++) {
            if (hashcode != 0) {
                hashcode = hashcode + String.valueOf(ch[i]).hashCode();
            } else {
                hashcode = String.valueOf(ch[i]).hashCode();
            }
        }
        return hashcode;
    }
}

Output:

[mary army ][abc ][rty ][cbc bcc ][dog god ]    Count=5