Java8-in-action.md

Java8 in action

lambda

stream

• stream();

• filter();

• map();

• flatMap() --combine all the streams into one

• district();

• count();

• limit();

• skip();

• findAny(), findFirst()

• anyMatch(), allMatch(), noneMatch()

• Arrays.stream()

Stateless & Stateful

• stateless: filter(), map()
• stateful: sum(), count(), sort()

Collect

• menu.stream().collect(groupingBy(Dish::getType))

Code example

• Optional max = numbers.stream().reduce(Integer::max)
• Stream lines = Files.lines(Paths.get("data.txt"), Charset.defaultCharset())