Academia-Style Code

CharacterGram.java

public Integer delta(String x) {

    HashMap<Character, Integer> map = new HashMap<Character, Integer>();
    Integer delta = 0;

    for (Character y : x.toCharArray()) {
        Integer count = map.get(y);
        count++;
        map.put(y,count);
    }

    for (Character c : map.keySet()) {
        Integer defcount = defmap.get(c);
        Integer count = map.get(c);

        delta += (defcount-count);
    }

    return delta;
}