efficient way to sort an array in java

1enum Code {
2    Str1(1), Str2(2), Str3(3), Str4(4), Str5(5));
3
4    int sortNumber;
5
6    Code(int sortNumber) {
7        this.sortNumber = sortNumber;
8    }
9
10    int returnNumber() {
11        return sortNumber;
12    }
13};
14
15public static void main(String[] args) {
16    List<Object> obj = new ArrayList<Object>();
17
18    Collections.sort(obj, new Comparator<Object>() {
19        @Override
20        public int compare(Object object1, Object object2) {
21            return Code.valueOf(object1.getStr()).returnNumber() > Code.valueOf(object2.getStr()).returnNumber() ? 1 : -1;
22        }
23    });
24}