[Chapter 06] Q&A

[corock]

아래 코드는 Chapter 6 에서 소개하는 코드입니다.
이중 옥에 티를 찾아보세요.

public class Mystery {

    public static void main(String[] args) {
        // p. 202
        long howManyDishes1 = menu.stream().collect(Collectors.counting());
        long howManyDishes2 = menu.stream().count();

        // p. 203
        int totalCalories1 = menu.stream().collect(Collectors.summingInt(Dish::getCalories));

        // p. 204
        double avgCalories = menu.stream().collect(Collectors.averagingInt(Dish::getCalories));

        // p. 208
        int totalCalories2 = menu.stream().map(Dish::getCalories).reduce(Integer::sum).get();

        // p. 207
        int totalCalories3 = menu.stream().mapToInt(Dish::getCalories).sum();
    }

}