Short form for Java If Else statement

I have a method which checks null's, I s there a way to short the method to less rows? the code looks "dirty"

private int similarityCount (String one, String two) {

    if (one==null && two==null) {
        return 1;
    } else if (one==null && two!=null) {
        return 2;
    } else if (one!=null && two==null) {
        return 3;
    } else {
        if(isMatch(one, two))
             return 4;
                return 5;
    }
}

Thanks