public int compare(Object o1,Object o2){
        String s1 = (String)o1;
        String s2 = (String)o2;
        int temp = s1.length() - s2.length();
        return temp == 0?s1.compareTo(s2):temp;
}

public int compare(Object o1,Object o2){
        String s1 = (String)o1;
        String s2 = (String)o2;
        int temp = s1.length() - s2.length();
        return temp == 0?s1.compareTo(s2):temp;
}