1時間毎の時間を取得するサンプル(Java6,Java8) Getting every one hour using Java6 and Java8

on Java6

    private void test1() {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd kk:mm:ss");
        Calendar calendar = Calendar.getInstance();
        calendar.set(Calendar.HOUR, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        calendar.set(Calendar.MILLISECOND, 0);
        for (int i = 0; i < 48; i++) {
            calendar.add(Calendar.HOUR, 1);
            System.out.println(format.format(calendar.getTime()));
        }
    }

on Java8

    private void test2() {
        LocalDateTime now = LocalDateTime.now().withHour(0).withMinute(0).withSecond(0).withNano(0);
        System.out.println(now.format(DateTimeFormatter.ISO_DATE_TIME));
        IntStream.range(0, 48).mapToObj(i -> now.plusHours(i)).forEach(p -> {
            System.out.println(p.format(DateTimeFormatter.ISO_DATE_TIME));
        });
    }