Jakub Milkiewicz

Hi

I would like to know how "ICJ" differs from Foundations of Security: What Every Programmer Needs to Know. Is ICJ is more "tutorial" book than Appress book, which is pretty techbology agnostic

Using pure reduction

public static Map<String, Integer> wordOccurrence(String sentence) { HashMap<String, Integer> reduce = Pattern.compile(" ").splitAsStream(sentence).map(x -> x.toLowerCase()).reduce(new HashMap<String, Integer>(), (HashMap<String,Integer> acc, String elem) -> { HashMap<String, Integer> map = new HashMap<>(acc); if (acc.containsKey(elem)) { map.put(elem, acc.get(elem) + 1); } else { map.put(elem, 1); } return map; }, (x,y) -> { HashMap result = new HashMap<>(); result.putAll(x); result.putAll(y); return result; } ); return reduce;

or using grouping

return Pattern.compile(" ").splitAsStream(sentence).map(x->x.toLowerCase()).collect(groupingBy(x -> x, Collectors.reducing(0, x -> 1, Integer::sum)));