Java 输出秒 毫秒 微秒 纳秒

    public static void printEpoch() {
        Instant now = Instant.now();
        long epochSecond = now.getEpochSecond();
        long epochMilli = now.toEpochMilli();
        int nano = now.getNano();
        String epochMicroSecond = String.format("%d%d", epochSecond, nano / 1000);

        System.out.printf(" %d s %d 位%n %d ms %d 位%n %d μs %d 位%n %d%d ns %d 位%n"
                , epochSecond, String.valueOf(epochSecond).length()
                , epochMilli, String.valueOf(epochMilli).length()
                , Long.parseLong(epochMicroSecond), epochMicroSecond.length()
                , epochSecond, nano, String.format("%d%d", epochSecond, nano).length());
    }