Kredibiliti bahasa pengekodan yang cekap bergantung pada keupayaannya untuk mengurus tarikh dan masa. Dalam persekitaran maya Java, kami mendapat beberapa alatan terbina seperti tarikh, masa dan kalendar untuk mengendalikan isu berkaitan tarikh dan masa.
java. Kelas Sehingga Tarikh - Di Jawa, terdapat banyak kelas yang mengandungi kelas yang sangat penting untuk program ini. Kelas Tarikh mengendalikan operasi tarikh dan masa. Mereka adalah kelas dengan keupayaan antara muka boleh klon, boleh bersiri dan setanding.
Ekstrak tarikh dan masa semasa - Terdapat dua teknik untuk mengekstrak tarikh dan masa semasa menggunakan Java.
Pelaksanaan kelas tarikh
Pelaksanaan kelas kalendar
Dalam kaedah kelas tarikh, mula-mula kita akan mempertimbangkan rentetan yang mengandungi tarikh. Dengan menggunakan ini kita akan mendapat tarikh dan masa sebagai output. Dengan mengisytiharkan kelas kalendar, kami akan mencipta kelas contoh untuk mendapatkan masa semasa sistem dengan memanggil getTime().
Dalam artikel hari ini, kami akan membina beberapa kod Java untuk memaparkan masa dengan menatal jam dan bulan.
Dalam algoritma yang mungkin ini, kami cuba menunjukkan cara memaparkan masa dengan menatal jam dan bulan menggunakan Java.
Langkah 1 - Bermula.
Langkah 2 - Isytiharkan fungsi untuk setiap hari dalam tahun dan bulan.
Langkah 3 - Penyata, int jumlah =0.
Langkah 4 - i
Langkah 5 - Semak tahun lompat menggunakan isLeapYear(i) jika syarat dipenuhi?
Langkah 6 - Jika tidak, int i= 1. dan semak i
Langkah 7 - Jika syarat kelima dipenuhi; Jumlah = Jumlah + 366 atau, Jumlah = Jumlah + 365;
Langkah 8 - Lakukan lelaran i++.
Langkah 9 - Jika syarat ketujuh dipenuhi.
Langkah 10 - Kemudian, total=total+getNumberOfDaysInMonth(year,i);.
Langkah 11 - Lakukan lelaran i++.
Langkah 12 - Jika tidak, pulangkan jumlahnya.
Langkah 13 - Penamatan.
General Syntax:
public abstract void roll(int calendar_field, boolean up_down)
Using Date class:
package com.DataFlair.DateAndTime;
import java.util.Date;
public class CurrDateUsingDateClass{
public static void main(String args[]) {
Date date = new Date();
System.out.println(date.toString());
}
}
Using Calendar Class:
package com.DataFlair.DateAndTime;
import java.util.Calendar;
public class CurrDateUsingCalenderClass{
public static void main(String args[]) {
Calendar current = Calendar.getInstance();
System.out.println(current.getTime());
}
}
Di atas, kami menyebut sintaks yang mungkin untuk masalah yang diberikan. Dengan mengikuti sintaks ini, kami akan menulis beberapa program untuk mendapatkan masa dengan menatal jam dan bulan.
Kaedah 1 - Program Java untuk memaparkan masa dengan menatal jam dan bulan
Dalam kod binaan Java ini, kami cuba menerangkan cara menggunakan algoritma dan sintaks di atas untuk menatal masa mengikut jam dan bulan.
import java.util.Calendar;
import java.util.Date;
public class Calendarof2023 {
public static void main(String[] args) throws Exception{
Date d1 = new Date();
Calendar c1 = Calendar.getInstance();
Calendar c2 = Calendar.getInstance();
c1.setTime(d1);
c2.setTime(d1);
System.out.println("Today the date is " + d1.toString());
c1.roll(Calendar.MONTH, 50);
System.out.println("Date after rolling by 50 over month will be "+ c1.getTime().toString());
c1.roll(Calendar.HOUR, 70);
System.out.println("Date after rolling by 70 over hours will be "+ c1.getTime().toString());
c1.roll(Calendar.YEAR, 2);
System.out.println("Date after rolling by 2 over year is "+ c1.getTime().toString());
c2.roll(Calendar.MONTH, false);
System.out.println("Date after false rolling over month will be "+ c2.getTime().toString());
c2.roll(Calendar.HOUR, true);
System.out.println("Date after true rolling over hour will be "+ c2.getTime().toString());
c2.roll(Calendar.YEAR, true);
System.out.println("Date after true rolling over year is "+ c2.getTime().toString());
}
}
Today the date is Mon Apr 10 10:42:31 GMT 2023 Date after rolling by 50 over month will be Sat Jun 10 10:42:31 GMT 2023 Date after rolling by 70 over hours will be Sat Jun 10 08:42:31 GMT 2023 Date after rolling by 2 over year is Tue Jun 10 08:42:31 GMT 2025 Date after false rolling over month will be Fri Mar 10 10:42:31 GMT 2023 Date after true rolling over hour will be Fri Mar 10 11:42:31 GMT 2023 Date after true rolling over year is Sun Mar 10 11:42:31 GMT 2024
import java.util.*;
public class Calendar2023 {
public static void main(String args[]){
Calendar calndr = Calendar.getInstance();
System.out.println("The Current Month of the year"+ calndr.get(Calendar.MONTH));
calndr.roll(Calendar.MONTH, true);
System.out.println("The New Month is from the year: "+ calndr.get(Calendar.MONTH));
calndr.roll(Calendar.MONTH, false);
// Displaying the result after operation
System.out.println("The new month is: "+ calndr.get(Calendar.MONTH));
}
}
The Current Month of the year3 The New Month is from the year: 4 The new month is: 3
import java.util.*;
public class Main {
public static void main(String[] args) throws Exception {
Date d1 = new Date();
Calendar cl = Calendar. getInstance();
cl.setTime(d1);
System.out.println("today is the date - @ "+ d1.toString());
cl. roll(Calendar.MONTH, 100);
System.out.println("date after a month will be as per the calculation - > " + cl.getTime().toString() );
cl. roll(Calendar.HOUR, 70);
System.out.println("date after 7 hrs will be today is ->> "+ cl.getTime().toString() );
}
}
today is the date - @ Mon Apr 10 10:44:41 GMT 2023 date after a month will be as per the calculation - > Thu Aug 10 10:44:41 GMT 2023 date after 7 hrs will be today is ->> Thu Aug 10 08:44:41 GMT 2023
import java.util.Calendar;
public class CalendarExample {
public static void main(String[] args) {
Calendar cal = Calendar.getInstance();
System.out.println("Time is ----- >>:" + cal.getTime());
cal.roll(Calendar.YEAR, false);
System.out.println("Time rolling down the year, result is here--->>:" + cal.getTime());
cal.roll(Calendar.HOUR, true);
System.out.println("Time rolling up the hour is now ---->>>:" + cal.getTime());
}
}
Time is ----- >>:Mon Apr 10 10:45:26 GMT 2023 Time rolling down the year, result is here--->>:Sun Apr 10 10:45:26 GMT 2022 Time rolling up the hour is now ---->>>:Sun Apr 10 11:45:26 GMT 2022
import java.util.*;
public class GetCurrentDateAndTime2023{
public static void main(String args[]){
int day, month, year;
int second, minute, hour;
GregorianCalendar date = new GregorianCalendar();
day = date.get(Calendar.DAY_OF_MONTH);
month = date.get(Calendar.MONTH);
year = date.get(Calendar.YEAR);
second = date.get(Calendar.SECOND);
minute = date.get(Calendar.MINUTE);
hour = date.get(Calendar.HOUR);
System.out.println("Current date is now --->> "+day+"/"+(month+1)+"/"+year);
System.out.println("Current time is now --->> "+hour+" : "+minute+" : "+second);
}
}
Current date is now --->> 10/4/2023 Current time is now --->> 10 : 46 : 24
package com.DataFlair.DateAndTime;
import java.util.*;
import java.text.*;
public class DateFormatting{
public static void main(String args[]) {
Date CurrDate = new Date( );
SimpleDateFormat formatDate = new SimpleDateFormat ("E yyyy.MM.dd 'at' hh:mm:ss a zzz");
System.out.println("Current Date(Formatted) Like This:---> " + formatDate.format(CurrDate));
}
}
Current Date(Formatted) Like This:---> Mon 2023.04.10 at 10:47:17 AM GM
import java.util.Scanner;
public class Tptimedateexample {
public static void main(String[] args) {
long totalMilliseconds = System.currentTimeMillis();
long totalSeconds = totalMilliseconds / 1000;
long currentSecond = (int)(totalSeconds % 60);
long totalMinutes = totalSeconds / 60;
long currentMinute = (int)(totalMinutes % 60);
long totalHours = totalMinutes / 60;
long currentHour = (int)(totalHours % 24);
long totalDays = totalHours / 24;
int currentYear = (int)(totalDays / 365) + 1970;
long daysInCurrentYear = (totalDays - numberOfLeapYearsSince1970(currentYear)) % 365;
if (currentHour > 0) daysInCurrentYear++;
int currentMonthNum = getMonthFromDays(currentYear, (int) daysInCurrentYear);
String month = getMonthName(currentMonthNum);
int daysTillCurrentMonth = getNumOfDaysToReachThatMonth(currentYear, currentMonthNum);
int startDay = getStartDay(currentYear, currentMonthNum);
int today = (int) daysInCurrentYear - daysTillCurrentMonth;
String dayOfWeek = dayNameOfWeek( ((startDay + today) % 7));
System.out.println("Current date and time is here. Note That---->>>>: " + dayOfWeek + " " + month + " " + today +", " + currentYear +" " + currentHour + ":"+ currentMinute + ":" + currentSecond );
}
public static String dayNameOfWeek(int dayOfWeek) {
switch (dayOfWeek) {
case 2: return "Monday";
case 3: return "Tuesday";
case 4: return "Wednesday";
case 5: return "Thursday";
case 6: return "Friday";
case 7: return "Saturday";
case 1: return "Sunday";
default: return null;
}
}
public static int numberOfLeapYearsSince1970(long year) {
int count = 0;
for (int i = 1970; i <= year; i++) {
if (isLeapYear(i))count++;
}
return count;
}
public static int getMonthFromDays(int year, int days) {
int dayTracker = 0;
for (int i = 1; i <= 12; i++) {
dayTracker += getNumberOfDaysInMonth(year, i);
if (dayTracker > days) return i;
}
return 12;
}
public static int getNumOfDaysToReachThatMonth(int year, int month) {
int dayTracker = 0;
for (int i = 1; i < month; i++) {
dayTracker += getNumberOfDaysInMonth(year, i);
}
return dayTracker;
}
public static int getStartDay(int year, int month) {
final int START_DAY_FOR_JAN_1_1800 = 3;
int totalNumberOfDays = getTotalNumberOfDays(year, month);
return (totalNumberOfDays + START_DAY_FOR_JAN_1_1800) % 7;
}
public static int getTotalNumberOfDays(int year, int month) {
int total = 0;
for (int i = 1800; i < year; i++)
if (isLeapYear(i))
total = total + 366;
else
total = total + 365;
for (int i = 1; i < month; i++)
total = total + getNumberOfDaysInMonth(year, i);
return total;
}
public static int getNumberOfDaysInMonth(int year, int month) {
if (month == 1 || month == 3 || month == 5 || month == 7 ||
month == 8 || month == 10 || month == 12)
return 31;
if (month == 4 || month == 6 || month == 9 || month == 11)
return 30;
if (month == 2) return isLeapYear(year) ? 29 : 28;
return 0;
}
public static boolean isLeapYear(int year) {
return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
}
public static String getMonthName(int month) {
String monthName = "";
switch (month) {
case 1: monthName = "January"; break;
case 2: monthName = "February"; break;
case 3: monthName = "March"; break;
case 4: monthName = "April"; break;
case 5: monthName = "May"; break;
case 6: monthName = "June"; break;
case 7: monthName = "July"; break;
case 8: monthName = "August"; break;
case 9: monthName = "September"; break;
case 10: monthName = "October"; break;
case 11: monthName = "November"; break;
case 12: monthName = "December";
}
return monthName;
}
}
Current date and time is here. Note That---->>>>: Monday April 10, 2023 10:54:30
Di sini kita melihat beberapa kaedah rolling masa yang mungkin untuk kod java melalui sintaks dan algoritma. Semoga artikel ini membantu anda memahami cara pelbagai kaedah tatal yang disebutkan di sini berfungsi, yang melaluinya kami menyelesaikan masalah ini.
Atas ialah kandungan terperinci Program Java untuk memaparkan masa dengan menatal jam dan bulan. Untuk maklumat lanjut, sila ikut artikel berkaitan lain di laman web China PHP!