Implementing Monthly Calendar Program In JAVA

Introduction

In this blog, we will learn how to get started with Monthly Calendar Program in Java.

Software Requirement

JAVA, NOTEPAD.

import java.util.*;
import java.text.*;
public class MonthCalender {
public final static String[] monthcalender = {
"January", "February", "March", "April", "May", "June", "July",
"August", "September", "October", "November", "December"};
public final static int daysinmonths[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
private void displayMonth(int month, int year) {
int blankdays = 0;
System.out.println(" " + monthcalender[month] + " " + year);
if (month < 0 || month > 11) {
throw new IllegalArgumentException(
"Month " + month + " It is not valid and must lie in between 0 and 11");
}
GregorianCalendar cldr = new GregorianCalendar(year, month, 1);
System.out.println("Sunday Monday Tuesday Wednesday Thursday Friday Saturday");
blankdays = cldr.get(Calendar.DAY_OF_WEEK)-1;
int daysInMonth = daysinmonths[month];
if (cldr.isLeapYear(cldr.get(Calendar.YEAR)) && month == 1) {
++daysInMonth;
}
for (int i = 0; i < blankdays; i++) {
System.out.print(" ");
}
for (int i = 1; i <= daysInMonth; i++) {
if (i<=9) {
System.out.print(" ");
}
System.out.print(i);
if ((blankdays + i) % 7 == 0) {
System.out.println();
}
else {
System.out.print(" ");
}
}
}
public static void main(String[] args) {
int mon, yr;
MonthCalender moncldr = new MonthCalender();
if (args.length == 2) {
moncldr.displayMonth(Integer.parseInt(args[0])-1, Integer.parseInt(args[1]));
}
else {
Calendar todaycldr = Calendar.getInstance();
moncldr.displayMonth(todaycldr.get(Calendar.MONTH), todaycldr.get(Calendar.YEAR));
}
}
}