判断是否互为变形词

public static boolean isDeformation(String dataOne,String dataTwo) {

    if ( dataOne == null || dataTwo == null || dataOne.length() != dataTwo.length()) {
        return false;
    }

    char [] charOne = dataOne.toCharArray();
    char [] charTwo = dataTwo.toCharArray();

    int [] map = new int[256];

    for (int i = 0 ; i < dataOne.length(); i++) {
        map[charOne[i]]++;
    }

    for (int i = 0 ; i < dataTwo.length(); i++) {
        if (map[charTwo[i]] -- == 0) {
            return false;
        }
    }

    return true;
}