Introduction to Java Programming编程题5.33<显示当前日期和时间>

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/*Current data and time is August 18, 2015 6:8:23.*/public class CurrentTime {    public static void main(String[] args) {        showTime();    }    public static void showTime() {        final long PER_SECONDS_DAY =  60 * 60 * 24;        long totalSeconds = (System.currentTimeMillis() + 8 * 60 * 60 * 1000) / 1000;        long totaldays = totalSeconds / PER_SECONDS_DAY;        System.out.print("Current data and time is ");        showCurrentData(totaldays);        showCurrentTime(totalSeconds);    }    public static void showCurrentTime(long totalSeconds) {        long seconds = totalSeconds % 60;        long minutes = totalSeconds / 60 % 60;        long hours = totalSeconds / 60 / 60 % 24;        System.out.println(" " + hours + ":" + minutes + ":" + seconds + ".");    }    public static boolean isLeapYear(long year) {        if (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0))            return true;        else            return false;    }    public static void showCurrentData(long totaldays) {        final int START_YEAR = 1970;        int days, currentYear;        for (currentYear = START_YEAR; totaldays >= 365; currentYear++) {            if (isLeapYear(currentYear))                days = 366;            else                days = 365;            totaldays -= days;        }        int month = 1;        int n = perMonthDay(currentYear, month);        while (totaldays > n) {            totaldays -= n;            month++;            n = perMonthDay(currentYear, month);        }        totaldays++;        System.out.print(toMonthLetter(month) + " " + totaldays + ", " + currentYear);    }    public static String toMonthLetter(int month) {        String monthLetter = "";        switch (month) {            case 1: monthLetter = "January"; break;            case 2: monthLetter = "February"; break;            case 3: monthLetter = "March";  break;            case 4: monthLetter = "April";  break;            case 5: monthLetter = "May";    break;            case 6: monthLetter = "June";   break;            case 7: monthLetter = "July";   break;            case 8: monthLetter = "August"; break;            case 9: monthLetter = "September";  break;            case 10: monthLetter = "October";   break;            case 11: monthLetter = "November";  break;            case 12: monthLetter = "December";  break;        }        return monthLetter;    }    public static int perMonthDay(int currentYear, int month) {        int n;        switch (month) {            case 1: case 3: case 5: case 7: case 8: case 10: case 12:                n = 31;                break;            case 2:                if (month == 2) {                    if (isLeapYear(currentYear))                        n = 29;                    else                        n = 28;                    break;                }            default: n = 30;        }        return n;    }}
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